Software Open Access

A Computational Package for the Determination of Infrared Optical Constants Relevant to Astrophysics

Gerakines, Perry A.; Hudson, Reggie L.

We have developed a modified approach to the extraction of the real and imaginary parts of the refractive index (optical constants) of a thin film from a single transmission spectrum measured in the infrared spectral range.  Our algorithm is similar to those implemented by previous authors, with some major changes that yield results for strong absorptions where previous approaches fail: (1) an adaptive k-correction step size, (2) the use of a root-finding algorithm to obtain a more accurate k-correction at each iteration, and (3) a k-correction step that prevents non-physical results such as negative n-values that prevent convergence in the calculation algorithm.  The source code provided is written in Python 3.8.  An executable version, compiled for Windows 10, is also included. 

Version 1.01a includes everything from version 1.01 plus the data from Figures in the associated journal article. (Note that the filenames for the CH3OH data have been mistakenly swapped.)
Files (58.2 MB)
Name Size
CH3OH-Amorphous-10K_Figure2.txt
md5:08624fc1a9abe3dfb14d6147388efe4d
2.0 MB Download
CH3OH-Crystalline-120K_Figure2.txt
md5:ca72c9111a6731283f63257295f3c580
3.1 MB Download
CH4-Amorphous-8K_Figure8.txt
md5:028cb337aaa2c0f2ca528369b09667e4
2.3 MB Download
CH4-Crystalline-31K_Figure8.txt
md5:6e84ad9867c23187478c8130d6449dd4
2.2 MB Download
CO2-Amorphous-8K_Figure4.txt
md5:92d58611a3a1b2a1f440cbed5bdcbcac
957.0 kB Download
CO2-Crystalline-70K_Figure4.txt
md5:0c85e3d3a465e8820149658db8a9025e
3.4 MB Download
csi-nk.txt
md5:85be07bc802a058bd63331d00cd6be37
5.2 kB Download
example1-inputfile.txt
md5:b3a934b72a1314f0d7a1c591b07ca454
353 Bytes Download
example1-output.txt
md5:bcaf6a1301a0498d26697029b189ba6b
1.5 MB Download
example1-spectrum.txt
md5:d3be7759b171d7e32803116f46210fae
272.7 kB Download
icenk-inputfile.txt
md5:b3a934b72a1314f0d7a1c591b07ca454
353 Bytes Download
icenk.exe
md5:0106607bd1add4f9ccb01755296a338b
33.3 MB Download
icenk.py
md5:0f39e517705a2ee73a211483107ecc2b
55.6 kB Download
kbr-nk.txt
md5:925f3f5a326d4942804ce3eab852d923
385.9 kB Download
N2O-Amorphous-10K_Figure7.txt
md5:5b0394a99cf8aafca312d72ee4f3e348
1.9 MB Download
N2O-Crystalline-70K_Figure7.txt
md5:c2535686c5e71134bfa27cbdcb11f915
6.5 MB Download
README-BasicProcedure.pdf
md5:2376c76c970acbd04a0aed0e2744216a
109.8 kB Download
README-BasicProcedure.txt
md5:2659fdca06895432181537da2d1240ef
3.6 kB Download
README-Citation.txt
md5:64708909902659d5797f026664bb3c5d
278 Bytes Download
README-Contents.txt
md5:14d16584899ac2bb3ffde82ee19b3dc2
758 Bytes Download
README-InputParameters.pdf
md5:6eee06fb5b8a074453e7c39ca62fa455
121.0 kB Download
README-InputParameters.txt
md5:48f9d3196a9c2a56a4ca0f61a8554c70
3.7 kB Download
README-Win10.txt
md5:ed738908bae4019cabec79850f83f70e
396 Bytes Download
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