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We report on the anisotropic optical properties of single-crystal tin monosulfide (SnS). The components e a , e b , and e c of the pseudodielectric-function tensor hei ¼ he 1 i þ ihe 2 i spectra are taken from 0.73 to 6.45 eV by spectroscopic ellipsometry. The measured hei spectra are in a good agreement with the results of the calculated dielectric response from hybrid density functional theory. The hei spectra show the direct band-gap onset and a total of eight above-band-gap optical structures that are associated with the interband-transition critical points (CPs). We obtain accurate CP energies by fitting analytic CP expressions to second-energy-derivatives of the hei data. Their probable electronic origins and implications for photovoltaic applications are discussed. V C 2014 AIP Publishing LLC. [http://dx.

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