Aerosol Complex Refractive indices m=p-iq
Ice

 
Real and imaginary indices
# entries
Spectral range (micron)
Temperature (K)*
  62 
  167 - 8.6 106
213
  62 
  167 - 8.6 106
253
  468
 0.044 - 167
266
  62 
  167 - 8.6 106 
268
62
167 - 8.6 106
272

 
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Reference: 

S. G. Warren, Optical constants of ice from the ultraviolet to the microwave, Applied Optics,  23, 1206-1225 (1984).