Dear Kushboo,

Thanks for the tables.

I also compared different optical constants for ice mixtures and I
concluded that we should use or at least start using those by Warren
et al. (2008). They cover the relevant wavelength range with
sufficient spectral resolution — including the 6.0 µm H₂O bending
mode. In addition, at 6.0 µm the values of n and k are consistent with
those by Hudgins for several other temperatures. I add some info on
those at the bottom.

Next, I will send you the cross sections for the fluffy composite
grains with and without ice, this are two new d.Q* files, and also the
tables on our wavelength grid containing the interpolated n,k values
(the two L.nk_* files).

For the latter please plot just for compariosn and to check and to get
some ideas the n,k of the fluffy composite and with the original
tables that you gave me. 

Once you have these files, you can start plotting the cross sections
for the case with and without ice: For this read the file into the MC
code and produce a plot comparing the cross sections (Kabs, Ksca) from
the new and old d.qfluffy files. The cross sections are already
written by MC into the file Output/L.Kappa*, so when this file is
written you can stop /exit the MC code.

Afterwards we can discuss the results, and you can proceed with the
same comparison using the d.Q file for the icy grains.

Greetings,
Ralf



Ice Warren+08 T =266K complete wavelemngth range
w (mu)      n       k
20cm       1.78     0.0007   Warren+08
0.0044     0.82     0.164    Warren+08
6.061      1.3015   0.064    similar to Hudgins


Warren1984 see Fig.5.14 in Endrik book showing n,k 

Hudgins03 in one file at T=10,100, 140K in range between 100mu and
2.5mu. The 6mu band does not depend strongly on T.

 T/K w(mu) n         k
  10  6.   1.3085    0.075100
 100  6.   1.3161    0.061238
 140  6.   1.3175    0.056263



Ice Warren+08 T =266K complete wavelemngth range
w (mu)      n       k
20cm       1.78     0.0007   Warren+08
0.0044     0.82     0.164    Warren+08
6.061      1.3015   0.064    similar to Hudgins



Ice Preibisch93 too bad spectral resuluton for 6mu band
w (mu)      n        k
800         2        0.024
0.105       1.346    0.081   Preibisch93

For comparison:

Silicate
w (mu)      n       k
1000    1.6    0.95     Si_WD01
1.2m    3.4    0.004      "
1000    3.4    0.06     Si_D03
1.0m    3.4    0.001      "




