New accurate values of the imaginary part, k, of the refractive
index of water at T=22° supercooled water at T=-8° and
polycrystalline ice at T=-25° are reported. The k spectrum
for water in the spectral region 0.65-2.5 µm is found
to be in excellent agreement with those of previous studies. The
k values for polycrystalline ice in the 1.44-2.50 µm
region eliminate the large uncertainties existing among
previously published conflicting sets of data. The imaginary part
of refractive index of supercooled water shows a systematic shift
of absorption peaks toward the longer wavelengths compared with
that of water at warmer temperatures.
L. Kou, D. Labrie, P. Chylek, "Refractive indices of water and
ice in the 0.65-2.5 µm spectral range," Appl.
Opt.,32, 3531-3540 (1993).