The photofragmentation of CO2- (H2 O)m, m = 3-20 at 355 nm yields two types of anionic products: O-(H2O)m-k, 1 ≤ k ≤ 3, and CO2- (H2 O)m - k, 4 ≤ k ≤ 9, depending on the parent cluster size. The O-(H2O)m-k fragments, attributed to the dissociation of hydrated CO2-, are dominant for m = 3-7, while the water-evaporation products, CO2- (H2 O)m - k, take precedence for m = 8-20. The dissociation of CO2- is proposed to proceed via a hydration-stabilized excited state, originating from a low-lying CO2- resonance. In the evaporation channel, the suggested routes include cluster predissociation, CO2- photodissociation/recombination, and charge transfer to solvent.
ASJC Scopus subject areas
- Physics and Astronomy(all)
- Physical and Theoretical Chemistry