Abstract

The optical constants (n, k) of single crystalline InBi have been determined using a two-angle method applying Fresnel’s equations. The complex dielectric constant was then calculated using the relation ∊* = ∊1 − i∊2, where ∊1 = n2k2 and ∊2 = 2nk. Assuming a free-electron model, the volume plasma resonance energy was found from the crossover position of the n and k curves to be 10.3 eV. The energy loss functions − Im[1/∊] and − Im[1/(∊ + 1)], which have been interpreted as having maxima at the volume and surface plasma frequencies, respectively, when interband transitions are not significant, were plotted using the n and k data. These values were in general agreement with those obtained from the crossover point on the n and k curves and from the Ritchie relation Es=Ev/2.

© 1976 Optical Society of America

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