Confined Raman Scattering – Easy Access to the Surface Phonons of Specific Crystalline Solids |
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| Authors: | Helmut Werheit Volodimir Filipov Natalya Shitsevalova |
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| Institution: | 1. Experimental Physics, University Duisburg‐Essen, 47048 Duisburg, Germany;2. Rare Earth Refractory Compounds Laboratory (Dep.60), I. N. Frantsevich Institute for Problems of Materials Science, 03142 Kiev, Ukraine |
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| Abstract: | An easily feasible method to measure surface phonons of specific crystalline solids is described. Special experimental conditions allow confining Raman scattering to the surface region of crystals, while the contribution of bulk scattering to the spectra is largely excluded. Such conditions exist for example in the case of hexaborides, using FT Raman spectroscopy with a commercial spectrometer with ND:YAG laser excitation. We show results obtained on LaB6, SmB6 and boron carbide. The surface phonon spectra of LaB6 are analyzed by comparing them with bulk spectra and discussed in comparison with results of other experimental methods and theoretical calculations. |
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| Keywords: | Raman scattering Surface phonons Boron carbide Lanthanum Samarium |
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