Solvent-enabled photodissociation of CO2- in water clusters

Terefe Habteyes, Luis Velarde, Andrei Sanov

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Abstract

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.

Original languageEnglish (US)
Pages (from-to)268-272
Number of pages5
JournalChemical Physics Letters
Volume424
Issue number4-6
DOIs
StatePublished - Jun 24 2006

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ASJC Scopus subject areas

  • Physics and Astronomy(all)
  • Physical and Theoretical Chemistry

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