Collision induced dissociation of Ar/sub 2/. Details of the collision dynamics. [Geometry, two-dimensional trajectories, dissociation probability]
The reaction Ar/sub 2/+Ar..-->..3Ar is a prototypical problem in the study of collision induced dissociation since (a) the Ar/sub 3/ system is expected to behave classically for energies near and beyond the dissociation threshold and (b) the Ar/sub 2/ pair potential has been determined very accurately from gas kinetic properties and molecular beam experiments. The exact three dimensional cross sections for dissociation and exchange are known from previous work. Here we consider two dimensional trajectories in an effort to assess the effectiveness of various collision geometries. All results refer to Ar/sub 2/ initially in the ground state. We examine two specific types of initial configuration which we label orthogonal (perpendicular) and parallel (parallel). Detailed opacity functions were calculated at several energies for each configuration. In addition we have carried out zero impact parameter calculations for the dissociation probability as a function of energy. One can conclude from these studies that long range forces significantly affect the collision dynamics and that the orthogonal configuration is more important and representative of the three dimensional results than the collinear model frequently used in dissociation studies. (AIP)
- Research Organization:
- Department of Chemistry, Indiana University, Bloomington, Indiana 47401
- OSTI ID:
- 7354639
- Journal Information:
- J. Chem. Phys.; (United States), Journal Name: J. Chem. Phys.; (United States) Vol. 64:8; ISSN JCPSA
- Country of Publication:
- United States
- Language:
- English
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