title: Dissociation of sulfur dioxide by ultraviolet multiphoton absorption between 224 and 232 nm.
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.
authors.affiliation: Department of Chemistry and Chemical Biology, Cornell University, Ithaca, New York 14853, USA.
authors.forename: Amitavikram A
authors.initials: AA
authors.lastname: Dixit
authors.forename: Yuxiu
authors.initials: Y
authors.lastname: Lei
authors.forename: Keon Woo
authors.initials: KW
authors.lastname: Lee
authors.forename: Edwin
authors.initials: E
authors.lastname: Quiñones
authors.forename: Paul L
authors.initials: PL
authors.lastname: Houston
mesh_terms: D008956:Models, Chemical; D017785:Photons; D013458:Sulfur Dioxide / Q000737:chemistry* / Q000528:radiation effects*; D014466:Ultraviolet Rays
chemical_list: D013458:Sulfur Dioxide