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SM ISO690:2012 STAMOV, Ivan, SYRBU, Nicolae, KORZUN, B, URSACHI, Veaceslav, DOROGAN, Andrei, MASNIK, Alisa. Calculation of optical functions of exciton and electron transitions by means of kramers-kronig relations in CuAlS2 crystals. In: Moldavian Journal of the Physical Sciences, 2013, nr. 1-2(12), pp. 9-17. ISSN 1810-648X. |
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Moldavian Journal of the Physical Sciences | ||||||
Numărul 1-2(12) / 2013 / ISSN 1810-648X /ISSNe 2537-6365 | ||||||
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Pag. 9-17 | ||||||
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Excitonic reflection spectra of CuAlS2 crystals were measured at a temperature of 10 K for E||c and E||c polarizations. The shapes of the lines of ground states of Г4 and Г5 excitons were calculated by means of the Kramers-Kronig relations. Exciton parameters and the values of energetic gaps (Г7-Г6, Г6-Г6, and Г7-Г6) were determined. Optical reflection spectra in the depth of absorption band (Еg - 6 eV) were measured at 80 K for E||c and E||c polarizations. Optical functions n, k, ε1, ε2, d2ε1/dE2 and d2ε2/dE2 were calculated for both polarizations. The revealed peculiarities are ascribed to electronic transitions in the frame of theoretical calculations of the band structure for crystals from this group. |
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