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Dissertation / Thesis text Ehrlich, Gert Rathbun, Lynn Charles 2011-06-29T14:24:11Z 2011-06-29T14:24:11Z 10000-01-01 1979 The scattering of the hydrogenic molecules H2, D2, and HD from vacuum cleaved MgO (001) along the [110] azimuth has been studied. A thermal beam at 300 K and 80 K was used. Particular emphasis has been placed on the rotational inelastic processes which accompany diffraction of RD. Singularities in the scattering amplitude for the rotationally inelastic events have been found to significantly effect the scattered distributions. This effect, extremal scattering, has been explained in terms of a simple mechanism, allowing accurate calculation of the scattering profiles and angles. The scattering of helium along both the [110] and the [100] azimuths has also been studied. Anomalous shifts and structure have been seen in the diffraction lobes for scattering along the [110] azimuth. These are explained in terms of a wavelength dependent transition probability, calculated in the semiclassical approximation. Submitted by Carolyn Mead (cmead2@illinois.edu) on 2011-06-29T14:24:11Z No. of bitstreams: 1 1979_rathbun.pdf: 4795655 bytes, checksum: 73bc17671e5418cd05f3984b5a059dad (MD5) Made available in DSpace on 2011-06-29T14:24:11Z (GMT). No. of bitstreams: 1 1979_rathbun.pdf: 4795655 bytes, checksum: 73bc17671e5418cd05f3984b5a059dad (MD5) Previous issue date: 1979 Restriction data tranferred 2014-07-01T11:13:59-05:00 Original Data Group with Access UIUC Users [automated] Release Date: none Reason: Thesis Item marked as restricted to the 'UIUC Users [automated]' Group (id=2) by Carolyn Mead (cmead2@illinois.edu) on 2011-06-29T14:24:11Z Item is restricted indefinitely. Thesis U of I Only 397311 http://hdl.handle.net/2142/25560 en 1979 Lynn Charles Rathbun rotationally inelastic diffraction hydrogen scattering extremal scattering helium scattering Extremal effects in rotationally inelastic diffraction Physics Physics University of Illinois at Urbana-Champaign Dissertation Ph.D.