Boson peak of AsxS1−x glasses and theoretical calculations of low frequencies clusters vibrations |
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Authors: | R. Holomb V. Mitsa |
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Affiliation: | Uzhgorod National University, 32 Voloshyn Str., Uzhgorod 88000, Ukraine |
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Abstract: | The results of comparison of spectral position of the LF bands of g-As2S3 and g-As22S78 with theoretical calculations of vibrational spectra of different clusters (As2S4, As2S5, As2S6, AsS3-As3) in the LF region (10-85 cm−1) are given. The torsion type vibrations of the small chain-like clusters are located in the same spectral region as Boson peak of As-S glasses system. They can make several contributions to the LF spectrum. The cluster lengths by weight distribution functions f(L)*L are from 5.5 to 10.1 Å and from 4.5 to 7.5 Å for g-As2S3 and g-As22S78, respectively. The lognormal fittings of the f(L)*L functions give the most probably values about the 7.6 Å (for g-As2S3) and 6.2 Å (for g-As22S78). |
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Keywords: | 61.43.&minus j 78.30.&minus j |
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