Dissociation of sulfur dioxide by ultraviolet multiphoton absorption between 224 and 232 nm

J Phys Chem A. 2005 Mar 10;109(9):1770-5. doi: 10.1021/jp0453010.

Abstract

Multiphoton excitation and dissociation of SO(2) have been investigated in the wavelength range from 224 to 232 nm. Strong evidence is found for two-photon excitation to the H Rydberg state, followed by dissociation to SO + O and ionization of the SO product by absorption of a third photon. The two-photon excitation is resonantly enhanced via the C (1)B(2) intermediate state, and the two-photon yield spectrum thus bears a strong resemblance to the spectrum of this intermediate. Imaging of the O((3)P(2)), S((1)D(2)), and SO products suggests that, following dissociation of SO(2) from the H state, SO is produced in the A and B electronic states. S((1)D(2)) is produced both from two-photon dissociation of SO(2) to give S((1)D(2)) + O(2) and by single-photon dissociation of SO(+). In the former process, the O(2) is likely formed in all of its lowest three electronic states.

Publication types

  • Research Support, U.S. Gov't, Non-P.H.S.

MeSH terms

  • Models, Chemical
  • Photons*
  • Sulfur Dioxide / chemistry*
  • Sulfur Dioxide / radiation effects*
  • Ultraviolet Rays*

Substances

  • Sulfur Dioxide