Atom surface scattering

Harris J 1987 Notes on the theory of atom-surface scattering Phys.scr. 36 156... 

The summation of pair-wise potentials is a good approximation for molecular dynamics calculations for simple classical many-body problems [27], It has been widely used to simulate hyperthennal energy (>1 eV) atom-surface scattering ... 

THEORY OF RESONANT CHARGE TRANSFER IN ATOM-SURFACE SCATTERING... 

Accurate numerical techniques are available, which allow quantitative investigation of the atom-surface scattering process to be made, and which provide a standard for assessing the validity of the various approximations Despite the different approaches adopted by the numerical methods reviewed here, they are, nonetheless, interrelated and do lead to substantially the same results. 

In this chapter we have shown that the TDAN model gives a good description of the resonant charge-transfer process in atom-surface scattering. While it is unfortunate that exact solutions for the TDAN wavefunction cannot be obtained, the one-electron method can be used to find approximate solutions which allow qualitative predictions to be made. On the whole, these predictions are in reasonable accord with experimental Hndings. 

Theory of Resonant Charge Transfer in Atom-Surface Scattering 335... 

J.L. Beeby. The Debye-Waller Factor in Atom-Surface Scattering. Jpn. J. Appl. Phys. suppl. 2, part 2 Proceedings of the 2nd International Conference on Solid Surfaces (Kyoto), 1974, p. 537. 

Harvie, C. E., Theoretical investigations in geochemistry and atom surface scattering, Ph. D. Thesis, University of California, San Diego, CA, (1981). Cited on page 769. 

B. Extension to Surface Dynamics Inelastic Atom-Surface Scattering... 

Section II is devoted to setting up elementary concepts associated with collective vibrational motion of atoms for reference later in the discussion of experimental results. Section III deals with atom-surface scattering theory so that the reader unfamiliar with this kind of spectroscopy can relate to the quantities which are measured directly. A brief description of the helium scattering instmment then follows in Section IV. 

The theory of atom-surface scattering, applied to the inelastic scattering of helium atoms from crystalline surfaces, is sketched out only briefly enough here to describe the conceptual framework and to identify the quantities and issues which experimentalists deal with in carrying out the measurements [39]. 

An additional useful development that has been motivated by HAS experiments is the adaptation of the theory of atom-surface scattering to treat multiphonon excitations. It would appear to be particularly valuable for the characterization of the vibrational properties of organic films such as Lang-muir-Blodgett films and self-assembling monolayers which are currently of great interest. 

The use of noble gases other than He in atom-surface scattering suffers from the fact that the corresponding molecular beams are significantly inferior to He beams with regard to monochromaticity and intensity. In addition for noble gas atoms heavier than He the scattering process becomes dominated by multiphonon-excitations, thus reducing the flux in the elastic diffraction channels. 

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