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Title: INFRARED SPECTRA AND OPTICAL CONSTANTS OF NITRILE ICES RELEVANT TO TITAN's ATMOSPHERE

Abstract

Spectra and optical constants of nitrile ices known or suspected to be in Titan's atmosphere are presented from 2.0 to 333.3 {mu}m ({approx}5000-30 cm{sup -1}). These results are relevant to the ongoing modeling of Cassini CIRS observations of Titan's winter pole. Ices studied are: HCN, hydrogen cyanide; C{sub 2}N{sub 2}, cyanogen; CH{sub 3}CN, acetonitrile; C{sub 2}H{sub 5}CN, propionitrile; and HC{sub 3}N, cyanoacetylene. For each of these molecules, we also report new cryogenic measurements of the real refractive index, n, determined in both the amorphous and crystalline phases at 670 nm. These new values have been incorporated into our optical constant calculations. Spectra were measured and optical constants were calculated for each nitrile at a variety of temperatures, including, but not limited to, 20, 35, 50, 75, 95, and 110 K, in both the amorphous phase and the crystalline phase. This laboratory effort used a dedicated FTIR spectrometer to record transmission spectra of thin-film ice samples. Laser interference was used to measure film thickness during condensation onto a transparent cold window attached to the tail section of a closed-cycle helium cryostat. Optical constants, real (n) and imaginary (k) refractive indices, were determined using Kramers-Kronig analysis. Our calculation reproduces the complete spectrum,more » including all interference effects.« less

Authors:
;  [1];  [2]
  1. NASA Goddard Space Flight Center, Code 691, Greenbelt, MD 20771 (United States)
  2. Chemistry Department, US Naval Academy, 572 Holloway Road, Annapolis, MD 21402 (United States)
Publication Date:
OSTI Identifier:
21457029
Resource Type:
Journal Article
Journal Name:
Astrophysical Journal, Supplement Series
Additional Journal Information:
Journal Volume: 191; Journal Issue: 1; Other Information: DOI: 10.1088/0067-0049/191/1/96; Journal ID: ISSN 0067-0049
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; ACETONITRILE; AMORPHOUS STATE; ASTROPHYSICS; CONTROLLED ATMOSPHERES; CYANOGEN; FOURIER TRANSFORMATION; HYDROCYANIC ACID; INFRARED SPECTRA; INTERFERENCE; KRAMERS-KRONIG CORRELATION; PLANETS; PROPIOLONITRILE; REFRACTIVE INDEX; SPECTROMETERS; THIN FILMS; ATMOSPHERES; CORRELATIONS; FILMS; HYDROGEN COMPOUNDS; INORGANIC ACIDS; INORGANIC COMPOUNDS; INTEGRAL TRANSFORMATIONS; MEASURING INSTRUMENTS; NITRILES; OPTICAL PROPERTIES; ORGANIC COMPOUNDS; ORGANIC NITROGEN COMPOUNDS; PHYSICAL PROPERTIES; PHYSICS; SPECTRA; TRANSFORMATIONS

Citation Formats

Moore, Marla H, Hudson, Reggie, Ferrante, Robert F, and James Moore, W., E-mail: Marla.h.moore@nasa.go. INFRARED SPECTRA AND OPTICAL CONSTANTS OF NITRILE ICES RELEVANT TO TITAN's ATMOSPHERE. United States: N. p., 2010. Web. doi:10.1088/0067-0049/191/1/96.
Moore, Marla H, Hudson, Reggie, Ferrante, Robert F, & James Moore, W., E-mail: Marla.h.moore@nasa.go. INFRARED SPECTRA AND OPTICAL CONSTANTS OF NITRILE ICES RELEVANT TO TITAN's ATMOSPHERE. United States. https://doi.org/10.1088/0067-0049/191/1/96
Moore, Marla H, Hudson, Reggie, Ferrante, Robert F, and James Moore, W., E-mail: Marla.h.moore@nasa.go. Mon . "INFRARED SPECTRA AND OPTICAL CONSTANTS OF NITRILE ICES RELEVANT TO TITAN's ATMOSPHERE". United States. https://doi.org/10.1088/0067-0049/191/1/96.
@article{osti_21457029,
title = {INFRARED SPECTRA AND OPTICAL CONSTANTS OF NITRILE ICES RELEVANT TO TITAN's ATMOSPHERE},
author = {Moore, Marla H and Hudson, Reggie and Ferrante, Robert F and James Moore, W., E-mail: Marla.h.moore@nasa.go},
abstractNote = {Spectra and optical constants of nitrile ices known or suspected to be in Titan's atmosphere are presented from 2.0 to 333.3 {mu}m ({approx}5000-30 cm{sup -1}). These results are relevant to the ongoing modeling of Cassini CIRS observations of Titan's winter pole. Ices studied are: HCN, hydrogen cyanide; C{sub 2}N{sub 2}, cyanogen; CH{sub 3}CN, acetonitrile; C{sub 2}H{sub 5}CN, propionitrile; and HC{sub 3}N, cyanoacetylene. For each of these molecules, we also report new cryogenic measurements of the real refractive index, n, determined in both the amorphous and crystalline phases at 670 nm. These new values have been incorporated into our optical constant calculations. Spectra were measured and optical constants were calculated for each nitrile at a variety of temperatures, including, but not limited to, 20, 35, 50, 75, 95, and 110 K, in both the amorphous phase and the crystalline phase. This laboratory effort used a dedicated FTIR spectrometer to record transmission spectra of thin-film ice samples. Laser interference was used to measure film thickness during condensation onto a transparent cold window attached to the tail section of a closed-cycle helium cryostat. Optical constants, real (n) and imaginary (k) refractive indices, were determined using Kramers-Kronig analysis. Our calculation reproduces the complete spectrum, including all interference effects.},
doi = {10.1088/0067-0049/191/1/96},
url = {https://www.osti.gov/biblio/21457029}, journal = {Astrophysical Journal, Supplement Series},
issn = {0067-0049},
number = 1,
volume = 191,
place = {United States},
year = {2010},
month = {11}
}