Modulation spectroscopy at non-normal incidence with emphasis on the vacuum-uv spectral region | Zendy

D. E. Aspnes | Zendy; C. G. Olson | Zendy; D. W. Lynch | Zendy

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Modulation spectroscopy at non-normal incidence with emphasis on the vacuum-uv spectral region

Author(s) -

D. E. Aspnes,

C. G. Olson,

D. W. Lynch

Publication year - 1976

Publication title -

journal of applied physics

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.699

H-Index - 319

eISSN - 1089-7550

pISSN - 0021-8979

DOI - 10.1063/1.322620

Subject(s) - spectroscopy , optics , spectral line , modulation (music) , physics , incidence (geometry) , excited state , atomic physics , computational physics , materials science , quantum mechanics , acoustics

Expressions are given to analyze modulation spectra taken at non‐normal incidence. These expressions are used to determine the optimum angle of incidence to maximize the signal‐to‐noise ratio. Significant improvements are shown to be obtained in the vacuum‐uv spectral region by making measurements at relatively large angles of incidence. We apply these expressions to evaluate the field‐induced change in the dielectric function for the 20.5–21.0‐eV core‐level doublet in GaP from Schottky‐barrier electroreflectance data. The line shape obtained is consistent with that of a field‐modulated M0 critical point modified by a Coulomb attraction between the core hole and the excited electron.

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