Circular Dichroism in Fluorescence Emission Following the C 1s→π* Excitation and Resonant Auger Decay of Carbon Monoxide

Martin Pitzer; Philipp Schmidt; Christian Ozga; Andreas Hans; Philipp Reiß; Ivan D Petrov; Anton N Artemyev; Arno Ehresmann; André Knie; Philipp V Demekhin

doi:10.3390/molecules23071534

Circular Dichroism in Fluorescence Emission Following the C 1s→π* Excitation and Resonant Auger Decay of Carbon Monoxide

Molecules. 2018 Jun 26;23(7):1534. doi: 10.3390/molecules23071534.

Authors

Martin Pitzer¹, Philipp Schmidt², Christian Ozga³, Andreas Hans⁴, Philipp Reiß⁵, Ivan D Petrov^{6

7}, Anton N Artemyev⁸, Arno Ehresmann⁹, André Knie¹⁰, Philipp V Demekhin¹¹

Affiliations

¹ Institute of Physics and CINSaT, University of Kassel, Heinrich-Plett-Str. 40, 34132 Kassel, Germany. [email protected].
² Institute of Physics and CINSaT, University of Kassel, Heinrich-Plett-Str. 40, 34132 Kassel, Germany. [email protected].
³ Institute of Physics and CINSaT, University of Kassel, Heinrich-Plett-Str. 40, 34132 Kassel, Germany. [email protected].
⁴ Institute of Physics and CINSaT, University of Kassel, Heinrich-Plett-Str. 40, 34132 Kassel, Germany. [email protected].
⁵ Institute of Physics and CINSaT, University of Kassel, Heinrich-Plett-Str. 40, 34132 Kassel, Germany. [email protected].
⁶ Rostov State Transport University, Narodnogo Opolcheniya Square 2, 344038 Rostov-on-Don, Russia. [email protected].
⁷ Research Institute of Physics, Southern Federal University, Stachki Avenue 194, 344090 Rostov-on-Don, Russia. [email protected].
⁸ Institute of Physics and CINSaT, University of Kassel, Heinrich-Plett-Str. 40, 34132 Kassel, Germany. [email protected].
⁹ Institute of Physics and CINSaT, University of Kassel, Heinrich-Plett-Str. 40, 34132 Kassel, Germany. [email protected].
¹⁰ Institute of Physics and CINSaT, University of Kassel, Heinrich-Plett-Str. 40, 34132 Kassel, Germany. [email protected].
¹¹ Institute of Physics and CINSaT, University of Kassel, Heinrich-Plett-Str. 40, 34132 Kassel, Germany. [email protected].

Abstract

Dichroism in angle-resolved spectra of circularly polarized fluorescence from freely-rotating CO molecules was studied experimentally and theoretically. For this purpose, carbon monoxide in the gas phase was exposed to circularly polarized soft X-ray synchrotron radiation. The photon energy was tuned across the C 1s→π* resonant excitation, which decayed via the participator Auger transition into the CO⁺ A ²Π state. The dichroic parameter β1 of the subsequent CO⁺ (A ²Π → X ²Σ⁺) visible fluorescence was measured by photon-induced fluorescence spectroscopy. Present experimental results are explained with the ab initio electronic structure and dynamics calculations performed by the single center method. Our results confirm the possibility to perform partial wave analysis of the emitted photoelectrons in closed-shell molecules.

Keywords: circular dichroism; excitation of molecules; fluorescence spectra; partial wave analysis; polarization analysis.

MeSH terms

Carbon Monoxide / chemistry*
Circular Dichroism*
Models, Theoretical
Spectrometry, Fluorescence

Substances

Carbon Monoxide