Table of Contents
Laser Chemistry
Volume 5, Issue 5, Pages 239-255
http://dx.doi.org/10.1155/LC.5.239

Multiphoton Ionization/Fragmentation of SO2: Experimental and Computational Studies

1Department of Physical Chemistry, The Fritz Haber Research Center for Molecular Dynamics, The Hebrew University, Jerusalem 91904, Israel
2Department of Chemistry, University of California, Berkeley 94720, CA, USA
3The Fritz Haber Research Center for Molecular Dynamics, The Hebrew University, Jerusalem 91904, Israel
4IBM, East Fishkill Facility, Route 52, Hopewell Junction, 12533, NY, USA
5Intel Corporation, F1-231, 2601 Juliette Lane, Santa Clara 95051, CA, USA

Received 10 December 1984; Accepted 11 February 1985

Copyright © 1985 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.

Abstract

The ionic fragmentation pattern of SO2 was measured as a function of laser power at the 223–220 nm wavelength range. The time of flight (TOF) mass spectrum shows essentially no parent ions. The principal ions observed were SO+ and mass 32. The fraction of S+ ions increases monotonically with increasing laser power while the fraction of SO+ which dominates at low powers reaches a maximum and falls below that of S+. The fraction of both ions changes nonlinearly with the laser intensity and tends to level off at the higher powers. The results are found consistent with a statistical (maximum entropy) computation of the fragmentation pattern. By comparing the observed (S+ + O2+)/SO+ branching ratio vs. laser power with the computed branching ratio vs. energy uptake per parent molecule one obtains an energy uptake vs. laser power curve. The results are discussed in terms of the possible dissociation/ionization pathways.