Answers are grounded in this paper and cite their sources.
Experimental measurements consisting of ellipsometry (0.5-3.5 eV) and normal-incidence reflectance (3.0-11.6 eV) are used along with published data to determine the optical constants of indium from 0.5 to 15.5 eV. Although the over-all properties reflect free-electron behavior, departures from Drude theory can be understood in terms of interband transitions.
No takes yet. Share an insight, caveat, or question.
Koyama et al. (1973) studied this question.
Synapse has enriched 10 related papers. Consider them for comparative context: