Electron energy-loss spectra of CdS, CdSe, and CdTe

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A study has been made of the electron energy-loss spectra of the three IIB-VIA compounds, CdS, CdSe, and CdTe. These spectra have been obtained by both electron reflection and electron transmission. The electron-reflection measurements were made over an energy-loss range of 0 to 50 eV on single crystals cleaved in an ultrahigh vacuum atmosphere. Changes in these spectra were then observed as the surface was slowly contaminated. The electrontransmission measurements were made using as-grown platelets or thin films. The spectra of these compounds consist of a series of low-lying peaks between 0 and 9 eV associated with interband transitions from the valence band and a peak between 12 and 15 eV associated with an interband transition from the d band. There also exists a peak between 9 and 12 eV and another between 15 and 19 eV. The former has been tentatively identified as a surface-plasmon peak, the latter as a bulk plasmon. These results are compared with optical reflectivity measurements and induced-electron-emission measurements. © 1972 The American Physical Society.

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