Abstract
Photoreflectance spectroscopy was used to study the energy spectra of natural molybdenum disulfide samples at various temperatures. Measurements using Fourier transform infrared spectrometer make it possible to observe a fine structure in the photoreflectance spectra which appears due to transitions involving excited excitonic states. The K-exciton binding energy obtained from our experiments is about 90 meV. In addition, an optical transition involving the excited state from the H-point of the Brillouin zone was observed, and the corresponding H-exciton binding energy was found to be 77 meV.
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