Chemical Bonds in Solids: Volume 4: Semiconductor Crystals, by O. G. Karpinskii, B. A. Evseev (auth.), Academician N. N.

By O. G. Karpinskii, B. A. Evseev (auth.), Academician N. N. Sirota (eds.)

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D. Shinoda, S. Asanabe, and Y. Sasaki, J. Phys. Soc. , 19:269 (1964). I. Z. Radovskii, T. S. Shubina, P. V. Gel'd, and F. A. Sidorenko, Porosh. 2, p. 33 (1965). I. Z. Radovskii, F. A. Sidorenko, and P. V. Gel'd, Fiz. Metal. , 19:915 (1965). B. K. Voronov, L. D. Dudkin, N. I. Kiryukhina, and N. N. Trusova, Porosh. 1, p. 73 (1967). B. K. Voronov, L. D. Dudkin, N. I. Kiryukhina, and N. N. Trusova, Izv. Akad. Nauk SSSR, Neorg. , 4:58 (1968). B. K. Voronov, L. D. Dudkin, N. I. Kiryukhina, and N. N. Trusova, Izv.

V. LASHKAREV ET AL. 3'0 Fig. 4. 1 (1) and (a hV)2/3 EuS (a) and EuSe (b). = q>(hv) hl1. eV 0 (2) for films of torbidden transitions. This should be made more precise by studies of more perfect specimens. 84Jl. thick for EuS and EuSe, respectively, without taking account of Fresnel reflection. This introduced a certain systematic ert'or of the order of 10% in the determination of a, which exaggerated its true values. However, since we were interested in the relative spectral variation of a, the reflection could be neglected [12].

03 eV were obtained tor EuS and EuSe, respectively. These agreed, within the limits of error, with the values of torbidden direct transitions in these compounds, but differs substantially from the data in [14,15]. Using europium selenide as an example (Fig. 6), three different cases may be considered In the band scheme: 1) the conduction band is the d band of Eu; 2) the conduction band is the s land of Eu; 3) the d and s bands of europium overlap. It should be noted that electron transi;ions are possible from the p band of selenium (not shown in Fig.

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