Theoretical cross sections for Ion-Atom Collisions /
This dissertation is devoted to the study of an analytic method for calculating a second Born correction for direct reaction cross sections produced by asymptotically fast screened paxticles. A topical proof of the response theorem is provided which leads to a simple formula in terms of an on-shee...
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| Format: | Thesis Book |
| Language: | English |
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[Place of publication not identified] :
[publisher not identified] ;
1996.
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| Subjects: | |
| Online Access: | http://proxy.library.tamu.edu/login?url=http://proquest.umi.com/pqdweb?did=743266401&sid=1&Fmt=2&clientId=2945&RQT=309&VName=PQD |
| Summary: | This dissertation is devoted to the study of an analytic method for calculating a second Born correction for direct reaction cross sections produced by asymptotically fast screened paxticles. A topical proof of the response theorem is provided which leads to a simple formula in terms of an on-shee two-body t-matrix element at an energy determined by a vector form factor. Cross sections for the ls - 2s excitation of a hydrogen-like atom are compared with those obtained using a single-centered finite Hilbert basis set expansion. The numerical tools needed to implement this model leads, in a natural fashion, to an exploration of single-centered expansion coupled states calculations with basis sets large enough to achieve convergence in the intermediate collision energy range. Applications to the p + He+(n = 1, 2) and p+Li2+ (n = 1, 2) initial state systems are made using bases with a substantial number of orbitals. The results obtained establish the validity of this method for calculating excitation and electron removal cross sections even in situations where chaxge transfer is large. |
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| Item Description: | Vita. "Major Subject: Physics". |
| Physical Description: | xi, 84 leaves : illustrations ; 28 cm. Issued also on microfiche from University Microfilms Inc. |
| Bibliography: | Includes bibliographical references. |