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Mechanism of IR and UV Laser-Induced Evaporation and Ablation From Condensed Molecular Systems

Published online by Cambridge University Press:  28 February 2011

Peter Hess
Peter Hess*
Affiliation:
Institute of Physical Chemistry, University of Heidelberg, Im Neuenheimer Feld 253, D-6900 Heidelberg 1, F.R.G.
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Abstract

The main features of evaporation of organic molecules from Van der Waals films with resonant IR photons and ablation of organic material and fragments from polymers with UV photons, resulting from time-of-flight experiments, are discussed. These results point to a photothermal mechanism. The experimental facts known so far can be explained using thermodynamic and kinetic arguments. No principal difference is found for breaking Van der Waals bonds with IR photons and chemical bonds employing UV photons.

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