CDROM/APJS/V86/P713
Optical Constants of Ices (Hudgins+ 1993)
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Mid- and Far-Infrared Spectroscopy of Ices: Optical Constants and
Integrated
Absorbances
D. M. Hudgins, S. A. Sandford, L. J. Allamandola, & A. G. G. M.
Tielens
<1993, ApJS, 86, 713>
=1993ApJS...86..713H
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Abstract:
Laboratory spectra through the mid-infrared (4000 to 500 cm^-1 [2.520
micron]) have been used to calculate the optical constants (n and k)
and
integrated absorption coefficients (A) for a variety of pure and mixed
molecular ices of relevance to astrophysics. The ices studied were
H2O,
CH3OH, CO2, OCS, CH4, CO2+CH4, CO2+OCS, CO+CH4, CO+OCS, O2+CH4, O2+OCS,
N2+CH4, N2+OCS, H2O+CH4, H2O+OCS, and H2O+CH3OH+CO+NH3. In addition,
the
measurements have been extended through the far-infrared (500 to 50
cm^1
[20-200 micron]) for the H2O, CH3OH, and H2O+CH3OH+NH3 ices.
Keywords:
line: identification -- molecular data
Description:
There are 77 files containing tables 2A through 19B, the real (n) and
imaginary (k) indices of refraction for various pure ices and
mixtures. The files as originally submitted for the AAS CD-ROM had
file names that are not valid for ISO 9660, which requires a maximum
eight-character filename and three-character extension. A simple
UNIX shell script, called 'RENAME.SH' was run to rename the files to
standard ISO 9660 names. A companion shell script called
'UNNAME.SH' is provided that will reverse the file naming. To use
'UNNAME.SH', it and all of the data files should be copied to local
magnetic disk and the script invoked with the UNIX command:
$ sh UNNAME.SH
(If the user is working under another operating system, such as DOS
or VMS, the CD-ROM filenames should be left as is).
Note that this script assumes the files were copied to local disk
with names that are in all uppercase characters (the way they are
stored on the CD-ROM). Use the script 'UNNAMELO.SH' if your CD-ROM
device driver automatically translates the uppercase filenames to
lowercase. In general, though, the filenames as given on the CD-ROM
are sufficient for identifying the correct file. A table of contents
is provided in file TABLE.TOC which gives a description of the file
contents, the original filename as given by the authors and the
filename
as it appears on the AAS CD-ROM.
Each file has an identical 12-line prologue section which contains a
note about the source of the data, the reference to the printed
paper, and a header for the data records (see the EXAMPLE section given
below).
Following the prologue, each optical constant table record consists
of five floating point numbers, separated by ASCII TAB characters
(decimal 9). These numbers should be readable using FORTRAN
free-format reads or C scanf() function calls.
EXAMPLE:
|---+----1----+----2----+----3----+----4----+----5----+----6
This data was collected and compiled at the
NASA/Ames Research Center, Moffett Field, CA. Any
use of this data should recognize the parent
publication:
"Mid- and Far-Infrared Spectroscopy of Ices: Optical
Constants and Integrated Absorbances.", D.M.
Hudgins, S.A. Sandford, L.J. Allamandola, and A.G.G.M.
Tielens, Ap.J.Supp.Ser., 83, 713-870 (1993)
Freq.
%T, 10K
Freq.
n, 10K
k, 10K
(cm-1)
(cm-1)
50.153
100.03
50.153
1.7329
0.0000
51.117
100.05
52.082
1.7322
0.019900
52.082
99.929
54.011
1.7355
0.0000
53.046
100.05
55.940
1.7439
0.017200
54.011
100.02
57.869
1.7426
0.019200
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(End)
Lee Brotzman [ADS] 23Mar-1995