@article{Westerberg2005, abstract = {CO adsorption on Pt(1�1�1) was studied at temperatures between 373�K and 463�K in a pressure range of 1�נ10-8-3�נ10-5�Torr. Adsorption isotherms were obtained using sum frequency generation, (SFG). By correlating the normalized SFG signal to the surface coverage, the obtained isotherms are in satisfactory agreement with Langmuir adsorption, which is suitable for coverages up to a monolayer. Close to saturation coverage the heat of adsorption was determined to 113(�15)�kJ/mol, which is in close agreement to values obtained by single crystal adsorption calorimetry, low energy electron diffraction (LEED) and temperature programmed desorption (TPD) [Y.Y. Yeo, L. Vattuone, D.A. King, J. Chem. Phys. 106 (1997) 392; G. Ertl, M. Neumann, K.M. Streit, Surf. Sci. 64 (1977) 393].}, added-at = {2009-10-30T10:04:05.000+0100}, author = {Westerberg, Staffan and Wang, Chen and Somorjai, Gabor A.}, biburl = {https://www.bibsonomy.org/bibtex/2304250d74d811d252a747d89ed98f2f4/jfischer}, doi = {DOI: 10.1016/j.susc.2005.03.011}, interhash = {2d8a1a366c8aecc74d9cd8412131a79b}, intrahash = {304250d74d811d252a747d89ed98f2f4}, issn = {0039-6028}, journal = {Surf. Sci.}, keywords = {, Adsorption CO, Pt(111), SFG, heat isotherms, microcalorimetry platinum, science, surface}, number = {1-3}, pages = {137 - 144}, timestamp = {2009-10-30T10:04:21.000+0100}, title = {Heat of adsorption of CO on Pt(1�1�1) obtained by sum frequency generation vibrational spectroscopy--a new technique to measure adsorption isotherms}, url = {http://www.sciencedirect.com/science/article/B6TVX-4FSX4B2-2/2/db3031b6049b46ea8ecdf8bf92dc1c94}, volume = 582, year = 2005 } @article{Watanabe1993, abstract = {In diffusion over surfaces, diffusivities are often noticeably dependent upon the concentration of adsorbed material. This effect has made it difficult to derive reliable diffusivities from experiments on macroscopic crystals. A method is proposed for analyzing experiments in which spreading of an adsorbate is observed as a function of position and time. The diffusivity D(c) is represented by a trial function , in which D(0), a1, and a2 are arbitrary fitting pa profiles c1(x,t) for a given choice of fitting parameters, obtained by numerical integration of the diffusion equation, are then compared with the measured profiles. This procedure is repeated with different values of the fitting parameters until the best fit to experiment is obtained. Tests on concentration dependent diffusivities of different types reveal that this procedure is reliable, even when there is some competition between diffusion and desorption.}, added-at = {2009-10-30T10:04:05.000+0100}, author = {Watanabe, Fumiya and Ehrlich, Gert}, biburl = {https://www.bibsonomy.org/bibtex/23c04fcd08ef493d9976d588a63562ae4/jfischer}, doi = {DOI: 10.1016/0039-6028(93)90195-P}, interhash = {6bcb6a6915c22a4de0bfe562d00c3502}, intrahash = {3c04fcd08ef493d9976d588a63562ae4}, issn = {0039-6028}, journal = {Surf. Sci.}, keywords = {CO, concentration; diffusion; science surface}, number = {1-2}, pages = {183 - 196}, timestamp = {2009-10-30T10:04:20.000+0100}, title = {Surface diffusivities from concentration profiles}, url = {http://www.sciencedirect.com/science/article/B6TVX-46PBB8J-T8/2/51514537d3a7dee82ef030325a6bb451}, volume = 295, year = 1993 } @article{Wartnaby1996, abstract = {The reactions of CO, NO, and oxygen on platinum surfaces have received a great deal of research attention, because of both their industrial importance in the three-way automobile catalytic converter and the academic interest surrounding the kinetic oscillations observed under some conditions. Crucial parameters in many of the kinetic models of these systems are the coverage-dependent heats of adsorption of the reacting species, which, with the exception of isosteric data for CO, have not previously been determined experimentally. Here the results of microcalorimetric measurements of the heats of adsorption of CO, NO, and O2 as a function of coverage on Pt{110} are presented. The initial adsorption heats are 183, 160, and 335 kJ mol-1, respectively.}, added-at = {2009-10-30T10:04:05.000+0100}, author = {Wartnaby, C. E. and Stuck, A. and Yeo, Y. Y. and King, D. A.}, biburl = {https://www.bibsonomy.org/bibtex/256f247a03696ddf42b3fc98368c029ba/jfischer}, doi = {10.1021/jp953624d}, interhash = {1dd25d0fc9072e57f224066cfd9f856d}, intrahash = {56f247a03696ddf42b3fc98368c029ba}, issn = {0022-3654}, journal = {Journal of Physical Chemistry}, keywords = {CO, CO; NO; O; Pt(110); calorimeter, microcalorimetry science, surface}, month = {January}, number = 30, pages = {12483--12488}, publisher = {American Chemical Society}, timestamp = {2009-10-30T10:04:20.000+0100}, title = {Microcalorimetric Heats of Adsorption for CO, NO, and Oxygen on Pt{110}}, url = {http://dx.doi.org/10.1021/jp953624d}, volume = 100, year = 1996 } @article{Rupprechter2001, abstract = {The adsorption of CO on Pt(111) was studied by picosecond infrared-visible sum frequency generation (SFG) vibrational spectroscopy in a pressure range from 10-7 to 500 mbar and in a temperature range of 160-400 K. At low pressure the experiments were complemented by TPD, LEED, and AES. Terminally bonded (on-top) CO was the only species observed between 160 and 400 K, independent of gas pressure. The CO stretching frequency was blue-shifted by about 15 cm-1 with increasing pressure (up to 2097 cm-1), but no evidence for high-pressure CO species or surface roughening was found. The influence of defects was also investigated. CO adsorption on a defective (nonannealed) Pt(111) surface yielded peaks that were slightly broadened but otherwise identical to the defect-free surface. At 160 K, a second peak at 2085 cm-1 evolved above 50 mbar of CO. TPD revealed that under these conditions residual (contaminant) water adsorbs on the surface. The coadsorption of water and CO red-shifted the terminal CO peak by about 15 cm-1, resulting from the substrate-mediated interaction of CO and water.}, added-at = {2009-10-30T10:04:05.000+0100}, author = {Rupprechter, G. and Dellwig, T. and Unterhalt, H. and Freund, H.-J.}, biburl = {https://www.bibsonomy.org/bibtex/2c2bf24a247b6f1580d7b15f99e93eb19/jfischer}, doi = {10.1021/jp003585s}, interhash = {e1400d2322f3f88a1a207648d71cdf97}, intrahash = {c2bf24a247b6f1580d7b15f99e93eb19}, journal = {J. Phys. Chem. B}, keywords = {CO, Pt(111), SFG, adsorption, high platinum pressure;, science, surface}, pages = {3797�3802}, timestamp = {2009-10-30T10:04:18.000+0100}, title = {High-Pressure Carbon Monoxide Adsorption on Pt(111) Revisited: A Sum Frequency Generation Study}, url = {http://dx.doi.org/10.1021/jp003585s}, volume = 105, year = 2001 } @article{Poelsema1985, abstract = {The initial sticking probability of the reactive gases H2 and CO on a nearly defect free Pt(111) surface is studied in the temperature range 90�300 K by means of Thermal Energy Atom Scattering (TEAS). By means of TEAS relative initial sticking probabilities can he measured with great accuracy. H2/Pt(111): The initial sticking probability is found to increase with increasing surface temperature. The important role in the chemisorption process played by defects, even at concentrations < 10-3 is emphasized. A two-stage model is proposed to explain these results. CO/Pt(111): The initial sticking probability is found to decrease with increasing surface temperature. This observation is explained with a precursor model.}, added-at = {2009-10-30T10:04:05.000+0100}, author = {Poelsema, Bene and Verheij, Laurens K. and Comsa, George}, biburl = {https://www.bibsonomy.org/bibtex/20da2eccc95e2697a365be1ef93e66d47/jfischer}, doi = {10.1016/0039-6028(85)90181-5}, interhash = {bc5f0358cd4a0627bfb2a0d366ab4403}, intrahash = {0da2eccc95e2697a365be1ef93e66d47}, journal = {Surf. Sci.}, keywords = {CO, Pt(111), platinum science, sticking, surface}, pages = 496, timestamp = {2009-10-30T10:04:17.000+0100}, title = {Temperature dependency of the initial sticking probability of H2 and CO on Pt(111)}, volume = {152-153}, year = 1985 } @article{McEwen2003, abstract = {A comprehensive theory of the adsorption of CO on Pt(1�1�1) is developed to describe equilibrium properties as well as the adsorption and desorption kinetics. The basis is a multi-site lattice gas model which allows for adsorption at on-top and bridge sites, and includes site exclusion and lateral interactions out to second neighbour unit cells as well as a mean field to account for long ranged dipolar interactions between CO molecules. The theory reproduces the coverage and temperature dependence of pressure isotherms, partial coverages, heat of adsorption, total sticking coefficients, and isothermal and temperature-programmed desorption rates. The quality of the fits and the internal consistency of the theory are such that a number of minor inconsistencies in available experimental data can be identified and discussed.}, added-at = {2009-10-30T10:04:05.000+0100}, author = {McEwen, J. S. and Payne, S. H. and Kreuzer, H. J. and Kinne, M. and Denecke, R. and Steinr�ck, H. P.}, biburl = {https://www.bibsonomy.org/bibtex/277d0a0e1c512da827ba8b1d9dd38ed18/jfischer}, doi = {DOI: 10.1016/j.susc.2003.08.040}, interhash = {e62223700ef1c23ab2e4ba13f4e21360}, intrahash = {77d0a0e1c512da827ba8b1d9dd38ed18}, issn = {0039-6028}, journal = {Surf. Sci.}, keywords = {CO(ads);TPD, CO, Equilibrium and mechanics, science statistical surface thermodynamics}, number = {1-2}, pages = {47 - 69}, timestamp = {2009-10-30T10:04:16.000+0100}, title = {Adsorption and desorption of CO on Pt(1�1�1): a comprehensive analysis}, url = {http://www.sciencedirect.com/science/article/B6TVX-49H6SM8-2/2/24b7031c96ee3e4df0472c7820c2bfe0}, volume = 545, year = 2003 } @article{Jiang1992, abstract = {The sticking coefficient, S, of CO on clean and K-, O- and H-modified Pt(111) surfaces has been measured directly using a simple kinetic uptake method, as a function of CO and modifier coverage and surface temperature. A simple method is also introduced to determine the coverage-dependent desorption energy from these measurements without the need to know the pre-exponential factor or desorption order for those systems where S is only a function of coverage or only weakly dependent on temperature. The initial sticking coefficient of CO on clean Pt(111) is 0.9 and is independent of substrate temperature. The major influence of adsorbed K on the initial sticking coefficient of CO on Pt(111) at 320 K is site blocking, and the magnitude of this effect correlates well with the size of the adsorbed K ion or atom. The shape of S as a function of CO coverage for low K coverages in the ionic regime is similar to that of CO on clean Pt(111). A dramatic change occurs for K coverages near or greater than 0.24 ML, where S passes through a maximum at about of the saturation CO coverage and coincident CO and K desorption is observed. This behavior of S, which has not been seen before, can be fit quite adequately by a simple model that incorporates the reduced site blocking effects of K due to the CO-induced transition of K from a metallic neutral to an ionic state and the accompanying size change of K atoms. These results are best described by a coverage-dependent alkali-CO interaction. In additional studies, we find that adsorption of 0.25 ML O on Pt(111) has no effect on S for low CO coverages at 100 K, and only the saturation CO coverage is reduced from 0.59 to 0.31 ML. In contrast, adsorbed H reduces not only the CO saturation coverage but also S even at low CO coverages.}, added-at = {2009-10-30T10:04:05.000+0100}, author = {Jiang, L.Q. and Koel, B.E. and Falconer, J.L.}, biburl = {https://www.bibsonomy.org/bibtex/20321dba25651d1b538d9f3c68b6d6086/jfischer}, doi = {DOI: 10.1016/0039-6028(92)90065-E}, interhash = {6f00c7eaf6243cb196158eb6107f09cb}, intrahash = {0321dba25651d1b538d9f3c68b6d6086}, issn = {0039-6028}, journal = {Surf. Sci.}, keywords = {CO, Pt(111), science surface}, number = 3, pages = {273 - 284}, timestamp = {2009-10-30T10:04:13.000+0100}, title = {Effects of K, O, and H adatoms on the adsorption kinetics of CO on Pt(111)}, url = {http://www.sciencedirect.com/science/article/B6TVX-46T37FX-H2/2/374facba7de16a568991a713a85e8a2d}, volume = 273, year = 1992 } @article{Jardine2009, abstract = {In this review we give a detailed description of the recently developed helium-3 spin-echo technique and its application to several classes of surface dynamic measurements. We review existing surface dynamical probes briefly and illustrate the need for new experimental tools that measure on nanoscale distances and over picosecond timescales. We then describe the helium-3 spin-echo method, which is one such tool, together with the approaches used to describe such measurements and the instrumentation developed to realise its application. The main application of helium-3 spin-echo is the study of surface dynamics, hence we review the approaches which have been established to interpret dynamical data and the signatures for various forms of motion, before going on to summarise the experimental studies to date. We also describe Fourier transform atom spectroscopy, a new method for measuring elastic and resonant scattering that is facilitated by the availability of spin-echo instruments. Finally, we look towards future scientific challenges for the technique.}, added-at = {2009-10-30T10:04:05.000+0100}, author = {Jardine, A.P. and Hedgeland, H. and Alexandrowicz, G. and Allison, W. and Ellis, J.}, biburl = {https://www.bibsonomy.org/bibtex/2dba7c21a81173ba7ade9f82b672d9d44/jfischer}, doi = {DOI: 10.1016/j.progsurf.2009.07.001}, interhash = {15b836ed1de0624a92f2ada3881d6d51}, intrahash = {dba7c21a81173ba7ade9f82b672d9d44}, issn = {0079-6816}, journal = {Prog. Surf. Sci.}, keywords = {CO, He Pt(111) Surface dynamics, echo, scattering, spin}, pages = {-}, timestamp = {2009-10-30T10:04:13.000+0100}, title = {Helium-3 spin-echo: Principles and application to dynamics at surfaces}, url = {http://www.sciencedirect.com/science/article/B6TJF-4X0MP7F-1/2/4b3a9cac32140a526ede2c1e79325b49}, volume = {In Press, Corrected Proof}, year = 2009 } @article{Gomer1990, abstract = {The theory of diffusion and the principal methods of determining surface diffusion coefficients are presented and their strengths and weaknesses discussed. A summary of major experimental results for diffusion of metallic and non-metallic adsorbates on metal surfaces is given and areas of agreement and disagreement between various measurements are discussed. A brief overview of principal conclusions, problem areas and future directions concludes the review.}, added-at = {2009-10-30T10:04:05.000+0100}, author = {Gomer, R}, biburl = {https://www.bibsonomy.org/bibtex/224fdb2dd31359fb715c41bc69ca9a0ba/jfischer}, doi = {10.1088/0034-4885/53/7/002}, interhash = {f72d366c748bba479be7dcea4669eded}, intrahash = {24fdb2dd31359fb715c41bc69ca9a0ba}, journal = {Reports on Progress in Physics}, keywords = {CO, Pt(111) diffusion, surface,}, number = 7, pages = {917-1002}, timestamp = {2009-10-30T10:04:12.000+0100}, title = {Diffusion of adsorbates on metal surfaces}, url = {http://stacks.iop.org/0034-4885/53/917}, volume = 53, year = 1990 } @article{Froitzheim1994, abstract = {Surface diffusion of CO on Pt(111) has been investigated with HREELS for temperatures between 280 and 420 K by measuring the stationary spatial variation of coverage produced on the Pt(111) surface by permanent impact of a CO-nozzle beam for different elevated temperatures at which the coverage is mainly controlled by the competition of adsorption and desorption. The Arrhenius parametrization of the diffusion coefficients yields Ediff[approximate]52.4 kJ/mol and a prefactor of 7.5�102�1 cm2/s. The data processing and the evaluation of the coverage dependent diffusion parameters are discussed in detail. The observed coverage dependence has been modelled by a simple random walk model and the quantitative results are compared with those of other studies.}, added-at = {2009-10-30T10:04:05.000+0100}, author = {Froitzheim, H. and Schulze, M.}, biburl = {https://www.bibsonomy.org/bibtex/28906d6b7583c8c23f3ccde537856f180/jfischer}, doi = {DOI: 10.1016/0039-6028(94)00498-6}, interhash = {ee0fdf6ce550f3ce19dea7036607e4a2}, intrahash = {8906d6b7583c8c23f3ccde537856f180}, issn = {0039-6028}, journal = {Surf. Sci.}, keywords = {CO, HREELS, PT(111), diffusion, science, site surface}, number = {1-2}, pages = {85 - 92}, timestamp = {2009-10-30T10:04:12.000+0100}, title = {Surface diffusion of CO on Pt(111): a HREELS study at high temperatures}, url = {http://www.sciencedirect.com/science/article/B6TVX-46T9NM4-H/2/f54f56d34f3cc6290a6b929c57f88261}, volume = 320, year = 1994 } @article{Froitzheim1977, abstract = {The surface vibrations of CO adsorbed on Pt(111) single crystal surfaces at 320 K have been studied by electron-energy-loss spectroscopy. At low coverages two vibration modes at 58 and \sim260 meV are observed. For exposures >0.2 Langmuir two additional modes at 45 and 232 meV develop. Considering also the observed LEED structures these vibrations are attributed to CO molecules being adsorbed upright in on-top and bridge sites, respectively.}, added-at = {2009-10-30T10:04:05.000+0100}, author = {Froitzheim, H. and Hopster, H. and Ibach, H. and Lehwald, S.}, biburl = {https://www.bibsonomy.org/bibtex/2c2251cb193da19d7742736d48d551c2e/jfischer}, doi = {10.1007/BF00882473}, interhash = {59a97aad51bcdabbb6aef9dae2ca928f}, intrahash = {c2251cb193da19d7742736d48d551c2e}, issn = {1432-0630}, journal = {Applied Physics A: Materials Science \& Processing}, keywords = {CO, Pt(111), adsorbation, science, site surface}, pages = {147-151}, timestamp = {2009-10-30T10:04:12.000+0100}, title = {Adsorption sites of CO on Pt (111)}, volume = 13, year = 1977 } @article{Conrad1978, abstract = {Adsorption, mutual interactions and transient product formation between oxygen and carbon monoxide on a Pd(111) surface were studied by means of LEED, UPS and isothermal as well as temperature-programmed desorption spectrometry at temperatures between 200 and 550 K. CO adsorption at 200 K was found to cause the formation of additional periodic overlayer structures above theta = 0.5, apart from the already known surface structures at theta < 0.5. Saturation is reached with a hexagonal close-packed layer at theta = 0.66 (Image ). Depending on the sequence of gas exposure and on the partial coverages of COad andOad, different stages of coadsorption (island formation, �compression� of the 2 � 2-Oad layer into a sqrt-3 � sqrt-3 R 30� structure, growth of a mixed phase with 2 � 1 periodicity etc.) may be distinguished, which influence the electronic properties and the reactivity of the adsorbates. At high surface concentrations CO2 formation proceeds with an appreciable rate already at 200 K,whereas at low coverages temperatures above 400 K are needed. The results demonstrate that no appropriate description of the kinetics of catalytic CO2 formation over the whole range of surface concentrations may be achieved in terms of simple rate laws involving coverage-independent rate constants (and activation energies) and mere surface concentrations of the reactants. There is on the other hand no indication for a reaction path involving the collision of a gaseous CO molecule with an adsorbed oxygen atom (Eley-Rideal mechanism), i.e. the reaction proceeds always with chemisorbed CO via Oad + COad to CO2 (Langmuir-Hinshelwood mechanism).}, added-at = {2009-10-30T10:04:05.000+0100}, author = {Conrad, H. and Ertl, G. and K�ppersa, J.}, biburl = {https://www.bibsonomy.org/bibtex/21e7f5b3fa2eccc44b78f6ef23a29a1e2/jfischer}, doi = {10.1016/0039-6028(78)90101-2}, interhash = {c59dd2973cee8f00bbf9902e89fd6849}, intrahash = {1e7f5b3fa2eccc44b78f6ef23a29a1e2}, journal = {Surf. Sci.}, keywords = {CO, oxygen; palladium, science, surface}, pages = {323-342}, timestamp = {2009-10-30T10:04:11.000+0100}, title = {Interactions between oxygen and carbon monoxide on a Pd(111) surface}, volume = 76, year = 1978 } @article{Borthwick2008, abstract = {Chemisorption of CO on the Fe{2�1�1} surface is studied within first-principles density functional theory (DFT) and single-crystal adsorption calorimetry (SCAC). The most stable molecular adsorption state corresponds to CO bound in a three-fold site involving one metal atom from the top layer and two metal atoms in the second layer. In this configuration, CO is tilted and elongated with a considerably red-shifted stretching frequency (calculated to be 1634�cm-1 as opposed to 2143�cm-1 for gas-phase CO). This state is very similar to that of CO on Fe{1�0�0} and Fe{1�1�1}, which is believed to be a precursor state to dissociation at relatively modest temperatures. However, dissociation of CO is found by DFT to be particularly facile on Fe{2�1�1}, with a dissociation barrier noticeably lower than that for CO on Fe{1�0�0} or Fe{1�1�1}. The 300�K coverage-dependent calorimetric data is consistent with either molecular or dissociative adsorption, with an initial adsorption heat of 160�kJ/mol. At higher coverages, the heat of adsorption and sticking probability data exhibit a forced oscillatory behaviour, which can be explained by assuming CO dissociation and subsequent diffusion of atomic carbon and/or oxygen into the substrate. It is argued that conditions for CO dissociation on Fe{2�1�1} are nearly optimal for Fischer-Tropsch catalysis.}, added-at = {2009-10-30T10:04:05.000+0100}, author = {Borthwick, David and Fiorin, Vittorio and Jenkins, Stephen J. and King, David A.}, biburl = {https://www.bibsonomy.org/bibtex/25ee146dc31e350d9a10d0a195baadcff/jfischer}, doi = {DOI: 10.1016/j.susc.2008.05.014}, interhash = {421a19b357efe2b2e76cba2e70c780b7}, intrahash = {5ee146dc31e350d9a10d0a195baadcff}, issn = {0039-6028}, journal = {Surface Science}, keywords = {CO, Density calculations, functional iron microcalorimetry, science, surface}, number = 13, pages = {2325 - 2332}, timestamp = {2009-10-30T10:04:07.000+0100}, title = {Facile dissociation of CO on Fe{2�1�1}: Evidence from microcalorimetry and first-principles theory}, url = {http://www.sciencedirect.com/science/article/B6TVX-4SK07P0-2/2/83e5565cf9ed038727428d22ffd49eb2}, volume = 602, year = 2008 } @article{Reutt-Robey1988, abstract = {A new technique, combining a pulsed supersonic molecular-beam source and time-resolved surface infrared spectroscopy, has been devised to measure the microscopic diffusion of molecules at surfaces. Following a rapid dose of a periodically stepped Pt(111) crystal face to a low total coverage of CO (~0.006 monolayer), the time evolution of CO molecules migrating from terrace to step sites was monitored with a temporal resolution as fast as 5 msec. When compared with a simple kinetic model, the data reveal statistical microscopic hopping rates for CO diffusion on the (111) plane over the T=95-195 K range investigated.}, added-at = {2009-10-01T16:01:09.000+0200}, author = {Reutt-Robey, J. E. and Doren, D. J. and Chabal, Y. J. and Christman, S. B.}, biburl = {https://www.bibsonomy.org/bibtex/271ec0eb0f5f09d49b32bd9c0a35e0bd9/jfischer}, doi = {10.1103/PhysRevLett.61.2778}, interhash = {b35938cae791d5fff7a2446cc04b9da6}, intrahash = {71ec0eb0f5f09d49b32bd9c0a35e0bd9}, journal = {Phys. Rev. Lett.}, keywords = {CO, IRAS Pt(111), diffusion,}, pages = {2778 - 2781}, timestamp = {2009-10-01T16:01:13.000+0200}, title = {Microscopic CO Diffusion on a Pt(111) Surface by Time-Resolved Infrared Spectroscopy}, url = {http://link.aps.org/doi/10.1103/PhysRevLett.61.2778}, volume = 61, year = 1988 } @article{Poelsema1982, abstract = {The capability of a He-scattering experiment to detect the migration of adsorbed molecules on monocrystal surfaces is demonstrated for the first time. CO migration and island formation can be investigated at very low coverages because of the very large cross section for He scattering of CO adsorbed on Pt(111). The activation energy for CO migration on Pt(111) is found to be 7 kcal/mole. No island formation at low CO coverages on a defect-free Pt(111) surface was detected in the temperature range 120-400 K.}, added-at = {2009-10-01T16:01:09.000+0200}, author = {Poelsema, Bene and Verheij, Laurens K. and Comsa, George}, biburl = {https://www.bibsonomy.org/bibtex/2139e032c08a4baccb80e2a7c3eb4d750/jfischer}, doi = {10.1103/PhysRevLett.49.1731}, interhash = {6d80e7bcacfa9c4e46103799d8788ece}, intrahash = {139e032c08a4baccb80e2a7c3eb4d750}, journal = {Phys. Rev. Lett.}, keywords = {CO, He, Pt(111), diffusion scattering,}, pages = {1731 - 1735}, timestamp = {2009-10-01T16:01:12.000+0200}, title = {He-Scattering Investigation of CO Migration on Pt(111)}, url = {http://link.aps.org/doi/10.1103/PhysRevLett.49.1731}, volume = 49, year = 1982 } @article{Poelsema1985, abstract = {The initial sticking probability of the reactive gases H2 and CO on a nearly defect free Pt(111) surface is studied in the temperature range 90�300 K by means of Thermal Energy Atom Scattering (TEAS). By means of TEAS relative initial sticking probabilities can he measured with great accuracy. H2/Pt(111): The initial sticking probability is found to increase with increasing surface temperature. The important role in the chemisorption process played by defects, even at concentrations < 10-3 is emphasized. A two-stage model is proposed to explain these results. CO/Pt(111): The initial sticking probability is found to decrease with increasing surface temperature. This observation is explained with a precursor model.}, added-at = {2009-10-01T16:01:09.000+0200}, author = {Poelsema, Bene and Verheij, Laurens K. and Comsa, George}, biburl = {https://www.bibsonomy.org/bibtex/21c575475433be4b95a3ba90590511c3a/jfischer}, doi = {10.1016/0039-6028(85)90181-5}, interhash = {bc5f0358cd4a0627bfb2a0d366ab4403}, intrahash = {1c575475433be4b95a3ba90590511c3a}, journal = {Surface Science}, keywords = {CO, Pt(111), sticking}, pages = 496, timestamp = {2009-10-01T16:01:12.000+0200}, title = {Temperature dependency of the initial sticking probability of H2 and CO on Pt(111)}, volume = {152-153}, year = 1985 } @article{Nekrylova1993, abstract = {The adsorption of CO on a Pt(111) surface held at 20 K under ultrahigh vacuum was investigated using vibrational and thermal desorption spectroscopies. In contrast to adsorption at higher temperatures, surface diffusion of chemisorbed CO across the surface was suppressed and vibrational spectroscopy showed non-equilibrium occupation of top, bridge and three-fold hollow sites. The saturation coverage of chemisorbed CO at 20 K was 0.5 ML. The infrared absorption band attributed to three-fold hollow site CO was centered at 1736 cm-1. The integrated absorbance of the 1736 cm-1 band grew in and saturated as the exposure was increased from 0.35 to 1 ML.}, added-at = {2009-10-01T16:01:09.000+0200}, author = {Nekrylova, J.V. and French, C. and Artsyukhovich, A.N. and Ukraintsev, V.A. and Harrison, I.}, biburl = {https://www.bibsonomy.org/bibtex/279ecdb8ff9f9a5f7686ed570810afd6e/jfischer}, doi = {DOI: 10.1016/0167-2584(93)91008-C}, interhash = {68b020f88719a30dea97668587f60398}, intrahash = {79ecdb8ff9f9a5f7686ed570810afd6e}, issn = {0167-2584}, journal = {Surface Science Letters}, keywords = {CO, Pt(111)}, number = {1-2}, pages = {L987 - L992}, timestamp = {2009-10-01T16:01:12.000+0200}, title = {Low temperature adsorption of CO on Pt(111): disequilibrium and the occupation of three-fold hollow sites}, url = {http://www.sciencedirect.com/science/article/B6X4J-47KPBHR-8H/2/90c0be5f8f44cd41b3e626db86c8f9a8}, volume = 295, year = 1993 } @article{McEwen2003, abstract = {A comprehensive theory of the adsorption of CO on Pt(1�1�1) is developed to describe equilibrium properties as well as the adsorption and desorption kinetics. The basis is a multi-site lattice gas model which allows for adsorption at on-top and bridge sites, and includes site exclusion and lateral interactions out to second neighbour unit cells as well as a mean field to account for long ranged dipolar interactions between CO molecules. The theory reproduces the coverage and temperature dependence of pressure isotherms, partial coverages, heat of adsorption, total sticking coefficients, and isothermal and temperature-programmed desorption rates. The quality of the fits and the internal consistency of the theory are such that a number of minor inconsistencies in available experimental data can be identified and discussed.}, added-at = {2009-10-01T16:01:09.000+0200}, author = {McEwen, J. S. and Payne, S. H. and Kreuzer, H. J. and Kinne, M. and Denecke, R. and Steinr�ck, H. P.}, biburl = {https://www.bibsonomy.org/bibtex/29a3b5fa64e0aed884bbf7c43665c45e9/jfischer}, doi = {DOI: 10.1016/j.susc.2003.08.040}, interhash = {e62223700ef1c23ab2e4ba13f4e21360}, intrahash = {9a3b5fa64e0aed884bbf7c43665c45e9}, issn = {0039-6028}, journal = {Surface Science}, keywords = {CO(ads);TPD CO, Equilibrium and mechanics, statistical thermodynamics}, number = {1-2}, pages = {47 - 69}, timestamp = {2009-10-01T16:01:12.000+0200}, title = {Adsorption and desorption of CO on Pt(1�1�1): a comprehensive analysis}, url = {http://www.sciencedirect.com/science/article/B6TVX-49H6SM8-2/2/24b7031c96ee3e4df0472c7820c2bfe0}, volume = 545, year = 2003 } @article{Ma1998, abstract = {We have measured the diffusion of CO on flat and stepped Pt(111) surfaces using the linear optical diffraction method from an adsorbate grating. Measurements over a wide range of temperatures (133�313 K) and CO coverages (0.1�0.67 ML) indicate Arrhenius behavior with diffusion activation energies of 3.0�4.7 kcal/mol and 7.3�7.9 kcal/mol for flat and stepped surfaces, respectively. Comparisons of our measurements on flat and stepped (defected) surfaces with previous experiments by various groups using various techniques resolves several discrepancies and illustrates the importance of defect-induced effects on variations in measured diffusion parameters.}, added-at = {2009-10-01T16:01:09.000+0200}, author = {Ma, Jianwei and Xiao, Xudong and DiNardo, N. J. and Loy, M. M. T.}, biburl = {https://www.bibsonomy.org/bibtex/284ac493b70902891aca8173df0fbd3c3/jfischer}, doi = {10.1103/PhysRevB.58.4977}, interhash = {e468fc66a5815addf4c065c59b86e4d3}, intrahash = {84ac493b70902891aca8173df0fbd3c3}, journal = {Phys. Rev. B}, keywords = {CO, Pt(111), diffusion}, month = Aug, number = 8, numpages = {6}, pages = {4977--4983}, publisher = {American Physical Society}, timestamp = {2009-10-01T16:01:11.000+0200}, title = {Diffusion of CO on Pt(111) studied by an optical diffraction method}, url = {http://link.aps.org/doi/10.1103/PhysRevB.58.4977}, volume = 58, year = 1998 } @article{Jiang1992, abstract = {The sticking coefficient, S, of CO on clean and K-, O- and H-modified Pt(111) surfaces has been measured directly using a simple kinetic uptake method, as a function of CO and modifier coverage and surface temperature. A simple method is also introduced to determine the coverage-dependent desorption energy from these measurements without the need to know the pre-exponential factor or desorption order for those systems where S is only a function of coverage or only weakly dependent on temperature. The initial sticking coefficient of CO on clean Pt(111) is 0.9 and is independent of substrate temperature. The major influence of adsorbed K on the initial sticking coefficient of CO on Pt(111) at 320 K is site blocking, and the magnitude of this effect correlates well with the size of the adsorbed K ion or atom. The shape of S as a function of CO coverage for low K coverages in the ionic regime is similar to that of CO on clean Pt(111). A dramatic change occurs for K coverages near or greater than 0.24 ML, where S passes through a maximum at about of the saturation CO coverage and coincident CO and K desorption is observed. This behavior of S, which has not been seen before, can be fit quite adequately by a simple model that incorporates the reduced site blocking effects of K due to the CO-induced transition of K from a metallic neutral to an ionic state and the accompanying size change of K atoms. These results are best described by a coverage-dependent alkali-CO interaction. In additional studies, we find that adsorption of 0.25 ML O on Pt(111) has no effect on S for low CO coverages at 100 K, and only the saturation CO coverage is reduced from 0.59 to 0.31 ML. In contrast, adsorbed H reduces not only the CO saturation coverage but also S even at low CO coverages.}, added-at = {2009-10-01T16:01:09.000+0200}, author = {Jiang, L.Q. and Koel, B.E. and Falconer, J.L.}, biburl = {https://www.bibsonomy.org/bibtex/2dd2de6c6dd9514cd876f9ae448a0a6aa/jfischer}, doi = {DOI: 10.1016/0039-6028(92)90065-E}, interhash = {6f00c7eaf6243cb196158eb6107f09cb}, intrahash = {dd2de6c6dd9514cd876f9ae448a0a6aa}, issn = {0039-6028}, journal = {Surface Science}, keywords = {CO, Pt(111)}, number = 3, pages = {273 - 284}, timestamp = {2009-10-01T16:01:11.000+0200}, title = {Effects of K, O, and H adatoms on the adsorption kinetics of CO on Pt(111)}, url = {http://www.sciencedirect.com/science/article/B6TVX-46T37FX-H2/2/374facba7de16a568991a713a85e8a2d}, volume = 273, year = 1992 }