REFRACTIVE-INDEXES OF WATER AND ICE IN THE 0.65-MU-M TO 2.5-MU-M SPECTRAL RANGE

New accurate values of the imaginary part, k, of the refractive index of water at T = 22-degrees-C, supercooled water at T = - 8-degrees-C a nd polycrystalline ice at T = - 25-degrees-C are reported. The k spect rum for water in the spectral region 0.65-2.5 mum is found to be in ex cellent agreement with those of previous studies. The k values for pol ycrystalline ice in the 1.44-2.50-mum region eliminate the large uncer tainties existing among previously published conflicting sets of data. The imaginary part of refractive index of supercooled water shows a s ystematic shift of absorption peaks toward the longer wavelengths comp ared with that of water at warmer temperatures.