The SPECTRAL Ice Chamber: Application to Titan's Stratospheric Ice Clouds

An ice chamber for obtaining thin-film transmission spectra of Titan-relevant organic ices between 50 and 11,700 cm−1 (200-0.85 m) is described in detail in this work. The ice chamber, called the SPECtroscopy of Titan-Related ice AnaLogs chamber, is located in the Spectroscopy for Planetary ICes Env...

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Bibliographic Details
Published in:The Astrophysical journal 2018-09, Vol.865 (1), p.62
Main Authors: Anderson, C. M., Nna-Mvondo, D., Samuelson, R. E., McLain, J. L., Dworkin, J. P.
Format: Article
Language:English
Subjects:
Analogs
Astrophysics
Cassini mission
Chemical composition
Chemical vapor deposition
Clouds
Diamonds
Ice
Ice clouds
Infrared analysis
Infrared spectra
Infrared spectrometers
Infrared transmission
methods: laboratory: solid state
Organic chemistry
planets and satellites: atmospheres
planets and satellites: composition
Radiative transfer
Refraction
Space flight
Space Sciences (General)
Spectroscopy
Spectrum analysis
Substrates
techniques: spectroscopic
Thin films
Titan
Vapors
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Summary:An ice chamber for obtaining thin-film transmission spectra of Titan-relevant organic ices between 50 and 11,700 cm−1 (200-0.85 m) is described in detail in this work. The ice chamber, called the SPECtroscopy of Titan-Related ice AnaLogs chamber, is located in the Spectroscopy for Planetary ICes Environments laboratory at NASA Goddard Space Flight Center. Organic vapors are typically deposited between 30 and 150 K via a variable leak valve onto a chemical vapor deposition diamond substrate, where condensation directly into the solid state occurs. Quantitative thin-film infrared transmission spectra of the given ice or ice mixture are then measured, from which optical constants (complex indices of refraction) are computed. These optical constants in turn provide the necessary input for interpreting radiative transfer analyses of Cassini's Composite InfraRed Spectrometer observations of Titan's organic stratospheric ice clouds to determine their chemical compositions, abundances, and vertical distributions as functions of Titan latitude and season.
ISSN:0004-637X
1538-4357
DOI:10.3847/1538-4357/aadbab