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Proceedings Paper

UV-laser-induced photolysis and desorption of molecules adsorbed on transparent substrates
Author(s): Vladimir N. Varakin; Alexander P. Simonov
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Paper Abstract

Dissociation and desorption of physisorbed on a transparent fused quartz surface halogenomethane molecules induced by their absorption of UV excimer laser radiation have been investigated. The desorption has occurred to be a nonlinear photoprocess. It required from 5 to 7 UV photons, which were not absorbed simultaneously. A desorption mechanism based on excitation of adsorption bond in course of several cycles of one-photon absorption followed by electron-vibrational relaxation has been proposed. Then the one-photon absorption spectra of these adsorbed molecules should be spread to much longer wavelengths compared with that of the gaseous species. A one-photon dissociation has taken place only for halogenomethane molecules that could be photolyzed by such excimer lasers in gaseous phase. A multiple photon dissociation of some molecules has been observed as a result of direct multiphoton absorption, successive fragmentation or photolysis of vibrationally photoexcited species.

Paper Details

Date Published: 2 September 2003
PDF: 8 pages
Proc. SPIE 5121, Laser Processing of Advanced Materials and Laser Microtechnologies, (2 September 2003); doi: 10.1117/12.513803
Show Author Affiliations
Vladimir N. Varakin, Karpov Institute of Physical Chemistry (Russia)
Alexander P. Simonov, Karpov Institute of Physical Chemistry (Russia)

Published in SPIE Proceedings Vol. 5121:
Laser Processing of Advanced Materials and Laser Microtechnologies
Friedrich H. Dausinger; Vitali I. Konov; Vladimir Yu. Baranov; Vladislav Ya. Panchenko, Editor(s)

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