Abstract
Plasmaresonance absorption on thin Ag foils and Ag-Ga alloys up to 19.3 at.% Ga is used to determine the optical constants ɛ of these foils. The same foils were taken to measure energy loss spectra of 50 keV electrons which were in good agreement with calculated ones obtained from the optically measured dielectric constants.
The measured changes of the optical constants with increasing Ga concentration agree with those deduced from the rigid band model.
The observed increasing of the plasmon damping near 3.8 eV is due to interband damping caused by theL 2′→L 1 transition. This can be shown by experiments on the plasma loss of Ga (13.8 eV) and Ga-Ag alloys.
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Diese Arbeit wurde unter Benutzung von Geräten der Deutschen Forschungsgemeinschaft im Institut für Angewandte Physik der Universität Hamburg angefertigt. Herrn Prof. Dr. H. Raether danken wir für die Themenstellung, sein förderndes Interesse und anregende Diskussionen.
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Bernert, B., Zacharias, P. Die optischen Konstanten von Silber-Gallium-Legierungen in der Nähe der Plasmafrequenz. Z. Physik 241, 205–216 (1971). https://doi.org/10.1007/BF01395329
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DOI: https://doi.org/10.1007/BF01395329