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No abstract available
Journal
Physics Uspekhi; ISSN 1063-7869; 
; v. 41(8); p. 834-837
; v. 41(8); p. 834-837
[en] The photoelectric yield of metallic clusters (Ag, Au) in the energy range between threshold and 10 eV has shown a completely different trend between the two metals and strong deviations from the bulk for Ag particles. On the contrary, good agreement has been obtained for both metals with the Fowler-Nordheim law near threshold. Attempts to explain the previous discrepancies with calculations of the density of states did not clarify the experimental differences observed. We have approached this problem from another point of view applying the theory of diffraction, the absorption of the radiation beam and the electron mean free path inside the cluster. Good agreement between the experimental results and the calculated curves has been obtained over the entire range of the s-band both for the Ag and Au particles. (orig.)
Journal
[en] The theory of spontaneous emission in dielectric media is extended to take proper account of dispersion and local field corrections. For the case of spontaneous emission in a plasma or radiative electron-hole recombination in a semiconductor, there are effectively no local field corrections. A shift of emission lines due to a dispersive host medium is predicted and interpreted. The corrections to spontaneous and stimulated emission due to dielectric interfaces in microcavity lasers are discussed
Journal
No abstract available
Journal
Verhandlungen der Deutschen Physikalischen Gesellschaft; ISSN 0420-0195; ; CODEN VDPEAZ; v. 32(5); p. 746
; CODEN VDPEAZ; v. 32(5); p. 746
No abstract available
Journal
No abstract available
Journal
Synchrotron Radiation in Natural Science; ISSN 1644-7190; ; v. 7(1-2); p. 129-130
; v. 7(1-2); p. 129-130
No abstract available
Journal
Physical Review. B, Condensed Matter and Materials Physics; ISSN 1098-0121; ; v. 79(8); p. 089901-089901.1
; v. 79(8); p. 089901-089901.1
[en] Core-level 4f7/2 photoemission spectra have been measured from a single, bifacial W crystal, which has both a flat W(110) and a vicinal, stepped W(110) [W(320)] surface. This procedure reduces uncertainties in the quantitative description of peaks in the spectra from W(320). Various analyses, including nonlinear least-squares curve fitting, show that the average surface core-level shift (SCS) for W(320) is only ∼-140 meV, compared to -310 meV for W(110) and that, at a maximum, only two of five terrace rows are isoelectronic to W(110) surface atoms. The absence of a large SCS for the step-edge atoms contradicts earlier interpretations of W(320) core-level spectra and departs significantly from expectations based on atomic-coordination models or tight-binding calculations of a bulk truncated surface. We suggest that systematic errors are responsible for the differences in reported core-level shifts for W(320). Implications of possible step-edge-driven atomic rearrangements are discussed
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