Abstract
Near-normal-incidence reflectance measurements are reported on the face-centered-cubic (fcc) phase of MnSe from 0.006 to 16 eV. The complex index of refraction and complex dielectric constant have been obtained from a Kramers-Kronig phase-shift dispersion analysis of normal-incidence reflectance data. The first-order infrared absorption (reststrahl) has been analyzed to yield the transverse and longitudinal optical-phonon frequencies near $\ensuremath{\Gamma}$, the high- and low-frequency dielectric constants, and an "ionicity" parameter. The ultraviolet dispersion has been correlated with single-electron interband transitions and many-body excitations. In addition to the room-temperature reflectance measurements, transmission data are reported over the range 0.04-2.8 eV down to 80 \ifmmode^\circ\else\textdegree\fi{}K. In this energy range no exchange-related structure was detected. The N\'eel temperature was obtained from specific-heat measurements and confirmed by an independent optical technique. The value obtained 247 \ifmmode^\circ\else\textdegree\fi{}K agrees with a previous determination. The results of this work are compared in detail with earlier work on MnO and MnS.
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