Table of Contents
Laser Chemistry
Volume 1, Issue 1, Pages 17-36

Spectral and Temperature Dependence of Laser Induced Dissociative Attachment in SF6

Laboratoire de Physique des Lasers, Associé au C.N.R.S. n°282 Centre Scientifique et Polytechnique, Université Paris-Nord, Villetaneuse 93430, France

Received 12 March 1982; Accepted 6 May 1982

Copyright © 1982 Hindawi Publishing Corporation. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


We consider the influence of resonant laser excitation upon the dissociative reaction between SF6 molecules and very low energy electrons. Experimentally, the use of valence electrons of atoms in Rydberg states ensures a well-defined energy resolution of the scattering electrons in the crossed beam apparatus. A spectroscopic model of the infrared absorption of CO2 laser radiation by SF6 gives a fair determination of the energy levels and vibrational transitions involved in the dissociative process. This reaction between highly excited atoms and a molecule is interpreted as a three step process: attachment of a quasi-free electron, followed by the interaction between the atomic ionic core and the negative molecular ion leading to a partial stabilization and, finally, the competition between the dissociating and the autodetachment channels.