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The infinite order sudden approximation and the delta-shell potential

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Title: The infinite order sudden approximation and the delta-shell potential
Author: Dancho, Stephen John
Degree Master of Science - MSc
Program Chemistry
Copyright Date: 1992
Abstract: The Infinite Order Sudden (IOS) approximation is applied to the collision of an atom with a diatom where the intermolecular potential is given by a delta-shell. It is shown that modelling the potential as such allows for a simpler calculation of the close-coupled equations, and using the MS results in even further savings in calculations. Exact and IOS calculations at 300K and 1000K are compared and it is found that the WS overestimates inelastic cross sections for both temperatures. A variety of corrections to the IOS are considered and the Energy Corrected MS (ECIOS) approximation is shown to be the best of those studied. Other possible improvements to the IOS are proposed.
URI: http://hdl.handle.net/2429/2947
Series/Report no. UBC Retrospective Theses Digitization Project [http://www.library.ubc.ca/archives/retro_theses/]

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