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Secrest, Don, Phillips, Timothy Roger 2015-05-13T15:39:29Z 2015-05-13T15:39:29Z 10000-01-01 1988 1988 Close-coupling and coupled states scattering calculations are applied to helium methane and neon-methane collisions. State-to-state and total differential cross sections calculated in the coupled states approximation are found to be in at least rough qualitative agreement with the close-coupling results, making the coupled states approximation a useful tool for analyzing particular scattering systems. The theoretical cross sections are compared to experimental measurements and are found to agree in part. The close-coupling calculations of helium-methane scattering show that some disagreements which are observed between the measured helium-methane differential cross sections and coupled states calculations cannot be due to the coupled states approximation. The close coupling calculation of neon-methane scattering and the failure of a thorough search for a neon-methane interaction potential which will fit theory fully to experiment show that disagreements which are observed between the measured neon-methane differential cross sections and coupled states calculations can be due neither to the coupled states approximation nor to the interaction potential. Comparison the results of coupled-states calculations which include closed rotational channels to the results of calculations which neglect them show that these closed channels have a slight influence on the calculated cross sections. The neglect of vibrational closed channels is suggested to be a possible source of disagreement between theory and experiment. Made available in DSpace on 2015-05-13T15:39:29Z (GMT). No. of bitstreams: 2 license.txt: 4848 bytes, checksum: 96035ab3f5e1c23cc7138a224ce498bd (MD5) 8815404.PDF: 8843539 bytes, checksum: 1eb24d6f3578d70c7639f6aad3c09768 (MD5) Previous issue date: 1988 Embargo set by: Seth Robbins for item 78527 Lift date: Forever Reason: Restricted to the U of I community idenfinitely during batch ingest of legacy ETDs Restricted to the U of I community idenfinitely during batch ingest of legacy ETDs U of I Only 399 p. Thesis (Ph.D.)--University of Illinois at Urbana-Champaign, 1988. http://hdl.handle.net/2142/77316 (UMI)AAI8815404 eng Chemistry, Physical Physics, Molecular Close-Coupling and Coupled States Scattering Calculations Applied to Collisions of Methane With Rare Gases text Chemical Engineering Chemical Engineering University of Illinois at Urbana-Champaign Dissertation Ph.D.