Journal of Physical Studies 5(1), 75–79 (2001) DOI: https://doi.org/10.30970/jps.05.75 INDIUM BROMIDE: OPTICAL SPECTRA IN THE 2–30 eV REGION M. I. Kolinko1, O. V. Bovgyra1, I. V. Kityk2, M. Piasecki2 1Ivan Franko National University of Lviv, Chair of Experimental Physics, 8 Kyrylo and Mefodij Str., Lviv, UA–79005, Ukraine 2Pedagogical University of Ch{\Polishe}stochova, Physics Institute, Al. Armii Krajovej 13/15, 42-200 Ch{\Polishe}stochova, Poland

Reflection spectra of the InBr monocrystals were measured at the liquid helium temperature in the region up to 30 eV using synchrotron radiation. The polarization dependence of spectra has been found for different crystallographic directions. The region up to 15 eV is assigned to the transitions from the valence bands of Br 4$p$ and In 5$s$, 5$p$. In the farther region the transitions from the halogen 4$s$ band exist as well. At about 19 eV the sharp doublet structure was observed due to the metal core $d$-states. The {\bf k}-space identification of the substantial structures has been accomplished on the basis of a study of the electron density distribution $ρ({\bf r})$, the energy band diagram of isostructural compounds and using group theory analysis as well. Possible interband transitions were determined and their orbital origin has been proposed.

PACS number(s): 78.40.Fy, 71.35.-y

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