Comparisons of the Reflection and Diffraction of3He,4He, H2, and D2from the (001) Surface of LiF

Autor:	R. L. Palmer, D. R. O'Keefe, Joe N. Smith, Howard Saltsburg
Rok vydání:	1970
Předmět:	Coupling Diffraction Scattering Chemistry Physics::Optics General Physics and Astronomy Rotational energy Reflection (physics) Physics::Accelerator Physics Matter wave Physical and Theoretical Chemistry Atomic physics Anisotropy Intensity (heat transfer)
Zdroj:	The Journal of Chemical Physics. 52:4447-4458
ISSN:	1089-7690 0021-9606
Popis:	Comparisons of the reflection and diffraction of thermal energy beams of 3He, 4He, H2, and D2 from the (001) surface of LiF are reported. Intense diffracted beams, including those of the second order, result from a freshly cleaved LiF surface without heating, and large exposures of H2O vapor do not reveal any measurable change in either the intensity, normalized to constant incident beam intensity, or location of such beams. The intensity and location of the individual beams are examined, taking into account the influence of adjacent beams. The locations of beams not so influenced display good agreement with the predictions of simple diffraction theory. The shapes and intensities of the diffracted beams are compared for the four gases with reference to possible inelastic effects. The decreasing intensities of diffracted beams for the same incident de Broglie wavelength are found to be in the order 4He, H2, and D2, i.e., in the order of increasing rotational energy coupling with the surface; 3He diffracted...
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::edfc40a540b9ca8141b4a532eb9ccbdb https://doi.org/10.1063/1.1673671 Zobrazit plný text záznamu