Three-photon photodissociation of adsorbed halomethanes by excimer lasers: A general mechanism
Abstract
The photolysis of halomethanes adsorbed on a transparent substrate by UV excimer lasers has been studied using mass spectrometry of desorbed species. The cubic dependence of photodissociation yield versus laser fluence was discovered. The three-photon dissociation (3PD) mechanism based on molecule transfer to a repulsive electronic state by means of two-photon absorption followed by laser-stimulated photon emission has been proposed. The role of molecular energy relaxation in resonance-enhancement of these processes is discussed.
- Publication:
-
Chemical Physics Letters
- Pub Date:
- September 2008
- DOI:
- 10.1016/j.cplett.2008.07.042
- Bibcode:
- 2008CPL...462..196V