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Theoretical studies of chemical reaction dynamics


Kaye, Jack Alan (1982) Theoretical studies of chemical reaction dynamics. Dissertation (Ph.D.), California Institute of Technology.


The collinear collision of an atom with a diatomic molecule has been studied within the frameworks of quantum and classical mechanics. Three major topics have been investigated.

In part I, the collinear collision of hydrogen atoms with hydrogen fluoride (and singly deuterium substituted variants of this system) have been studied in the exchange channel by coupled-channel quantum mechanical calculations using a realistic (high barrier) potential energy surface. We have also investigated the effect on the dynamics of varying the barrier height of the potential energy surface.

In part II, we consider the characterization of low energy resonances in the collinear H+H_2 and F+H_2(HD, DH, D_2) systems. A variety of characterization techniques are used; the most useful proves to be the variation with energy of the eigenvalues of the collision lifetime matrix.

In part III, we develop the method of hyperspherical coordinates for the study of collinear reactive atom-diatomic molecule collisions. The method is tested for the H+H_2 system, and is applied to a model system above the threshhold for collision-induced dissociation and to reactions in which a light atom (hydrogen) is transferred between two heavy ones. Systems of this type studied include I+HI and Br + HCl; we also consider some aspects of the dynamics in the Cl+HCl system. We develop the formalism to extract the physical scattering wave function from the method and present preliminary results of probability densities and probability current densities on the H+H_2 system. We also consider the formulation of the method in the adiabatic representation and examine both numerically and analytically the behavior of the coupling matrices at large values of the propagation variable. Convergence properties of the method are investigated in detail for the H+H_2 and F+H_2 systems. Quasi-classical trajectory calculations have been used to help understand the results obtained and to determine the importance of quantum mechanical effects.

Item Type:Thesis (Dissertation (Ph.D.))
Subject Keywords:Chemistry
Degree Grantor:California Institute of Technology
Division:Chemistry and Chemical Engineering
Major Option:Chemistry
Thesis Availability:Restricted to Caltech community only
Research Advisor(s):
  • Kuppermann, Aron
Thesis Committee:
  • Unknown, Unknown
Defense Date:21 January 1982
Record Number:CaltechTHESIS:02152012-151600900
Persistent URL:
Default Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:6823
Deposited By: John Wade
Deposited On:16 Feb 2012 16:18
Last Modified:26 Dec 2012 04:40

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