A classical path approximation for diffractive surface scattering |
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Authors: | Hans-Dieter Meyer JPeter Toennies |
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Institution: | Theoretische Chemie, Physikalisch — Chemisches Institut, Universität Heidelberg. Im Neuenheimer Feld 253, D-6900 Heidelberg, Fed. Rep. of Germany;Max-Planck-Institüt fur Strömungsforschung, Böttingerstrasse 6 — 8, D — 3400 Göttingen, Fed. Rep. of Germany |
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Abstract: | The well-known classical path approximation is applied to a calculation of diffraction intensities in the scattering of atoms from a rigid crystal with a soft interaction potential. A general expression is derived for the diffraction intensities which can be applied to potentials with several higher-order terms in the Fourier series. For an uncorrugated Morse potential with a first-order exponential corrugation term an analytic solution is obtained which is compared with the infinite order suddent (IOS) approximation calculations for Ne/W(110) and He/LiF(100). Both approximations are very accurate for the weakly corrugated Ne/W system. For He/LiF the present approximation is more accurate than the sudden (IOS) approximation and has the added advantage of providing an analytic solution. Several improvements are suggested. |
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