Forsterite reflection spectra in low temperature

The infrared reflectivities or single crystalline forsterite (Mg2SiO4) were measured for the temperature range 300 - 50 K for each crystal axis, between wavenumber 5000 - 100 cm(-1) ( wavelength : 2 - 100 mu m). The spectra show significant dependence of temperature, most of die bands becomes more intense, sharper, and thier peak positions shift to higher wavenumber with temperature decreased. Reflection spectra were fitted with dispersion formula of damped oscillator model to derive the oscillator parameters that. are handy and useful in assessing optical constants of forsterite in low temperature. The absorption spectra of forsterite, powder are calculated for spherical shape, CDE, and hollow-sphere shape distributions under Rayleigh approximation to predict emission spectra in low temperature environment.