Publications

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1993
Kim, B, Chen J, Erskine JL, Mei WN, Wei CM.  1993.  SURFACE AND BULK PHOTOELECTRON DIFFRACTION FROM W(110) 4F CORE LEVELS, Aug. Physical Review B. 48:4735-4740., Number 7 AbstractWebsite

Energy- and angle-dependent photoelectron cross sections from surface and bulk W(110) 4f7/2 core levels are measured and compared with dynamical multiple scattering calculations. The agreement between experimental and theoretical results is found to be significantly better than corresponding previous studies, permitting a determination of the first layer atomic plane distance: d12 = 2.26 +/- 0.05 angstrom. Forward-scattering enhancements along bond directions are observed under selected scattering conditions. In all cases, final-state multiple scattering accounts for the principal energy and angle dependencies in the cross section. Typical variation of bulk and surface 4f photoelectron intensities with kinetic energy or emission angle resulting from final-state effects is observed to be a factor of 2. This result suggests that previous core-level spectra for stepped W(110) surfaces have been incorrectly interpreted.

1992
Kao, HC, Kuo TY, Yen HP, Wei CM, Huang KN.  1992.  RELATIVISTIC CROSS-SECTIONS OF ELECTRON-IMPACT IONIZATION OF HYDROGENIC IONS, Apr. Physical Review A. 45:4646-4652., Number 7 AbstractWebsite

Total and single-differential cross sections for electron-impact ionization are calculated in a relativistic formulation for ions in the hydrogen isoelectronic sequence: HI, He II, C VI, Ne X, Fe XXVI, and Ag XLVII. Transition amplitudes are evaluated in the two-potential distorted-wave approximation. Sets of different asymptotic charges are used to study the mutual screening of the primary and secondary electrons. Relativistic effects are investigated by taking the nonrelativistic limit and are found to increase the cross sections. Thomson’s scaling law along the isoelectronic sequence is also studied.

1987
Cohen, ML, Chou MY, Knight WD, Deheer WA.  1987.  PHYSICS OF METAL-CLUSTERS, Jun. Journal of Physical Chemistry. 91:3141-3149., Number 12 AbstractWebsite
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Knight, WD, Deheer WA, Saunders WA, Clemenger K, Chou MY, Cohen ML.  1987.  ALKALI-METAL CLUSTERS AND THE JELLIUM MODEL, Feb. Chemical Physics Letters. 134:1-5., Number 1 AbstractWebsite
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Deheer, WA, Knight WD, Chou MY, Cohen ML.  1987.  ELECTRONIC SHELL STRUCTURE AND METAL-CLUSTERS. Solid State Physics-Advances in Research and Applications. 40:93-181. AbstractWebsite
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1984
Knight, WD, Clemenger K, Deheer WA, Saunders WA, Chou MY, Cohen ML.  1984.  ELECTRONIC SHELL STRUCTURE AND ABUNDANCES OF SODIUM CLUSTERS. Physical Review Letters. 52:2141-2143., Number 24 AbstractWebsite
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1981
Kauppila, WE, Stein TS, Smart JH, Dababneh MS, Ho YK, Downing JP, Pol V.  1981.  Measurements of total scattering cross sections for intermediate-energy positrons and electrons colliding with helium, neon, and argon. Physical Review A. 24:725., Number 2: APS Abstract1981_3.pdf

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1975
Ho, YK, Fraser PA, Kraidy M.  1975.  The S-wave elastic scattering of positrons by helium in the coupled static approximation. Journal of Physics B: Atomic and Molecular Physics. 8:1289., Number 8: IOP Publishing Abstract1975_3.pdf

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