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Elastic and inelastic scattering of slow positrons from a LiF(100) surface (1984)

Cook, D. R. ; Horsky, T. N. ; Coleman, P. G.

Springer

Applied physics 34 (1984), S. 237-242

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ISSN: 1432-0630

Keywords: 79.20.Hx ; 79.20.Kz

Source: Springer Online Journal Archives 1860-2000

Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics

Notes: Abstract The intensity profile for the elastic specular reflection of 5–100 eV positrons from a LiF(100) surface (ang1e of incidence 45°) has been measured using a simple time-of-flight spectrometer. The profile exhibits strong maxima below 25 eV and a smaller peak at 57 eV. Positron energy loss spectra have also been measured for a range of incident energies by retarding field analysis of the scattered beam. The mean energy loss appears to increase with increasing incident beam energy. Both the elastic and inelastic results are compared with similar data for slow-electron scattering obtained with the same apparatus.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/BF00616578

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Some comments on the counterpoise correction for the basis set superposition error at the correlated level (1993)

Cook, D .B. ; Sordo, J. A. ; Sordo, T. L.

New York, NY : Wiley-Blackwell

International Journal of Quantum Chemistry 48 (1993), S. 375-384

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ISSN: 0020-7608

Keywords: Computational Chemistry and Molecular Modeling ; Atomic, Molecular and Optical Physics

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Chemistry and Pharmacology

Notes: The use of the counterpoise method for the mitigation of basis set superposition error at the correlated level is discussed. Evidence is presented to show that the ghost basis plays a dual role in the counterpoise method: The orbitals of the system are improved by the ghost basis but at the expense of a nonphysical increase in the dimension of the virtual space. This second factor has no effect on application of the counterpoise method at the SCF level but it makes the use of the counterpoise method at the correlated level much less straightforward. © 1993 John Wiley & Sons, Inc.

Additional Material: 4 Ill.