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Absorption coefficients of solid NH3 from 50 to 7000 per cmThin-film spectra of solid NH3 at a resolution of 1 per cm were used to determine its absorption coefficient over the range 50-7000 per cm. The thin films were formed inside a liquid N2 cooled dewar using a variety of substrates and dewar windows. The spectra were recorded with two Fourier spectrometers, one covering the range from 1 to 4 microns and the other from 2.6 to 200 microns. The thickness of the films was measured with a laser interference technique. The absorption coefficients were determined by application of Lambert's law and by a fitting procedure to the observed spectra using thin-film theory. Good agreement was found with the absorption coefficients recently determined by other investigators over a more restricted wavelength range. A metastable phase was observed near a temperature of 90 K and its absorption coefficient is reported. No other major spectral changes with temperature were noted for the range 88-120 K.
Document ID
19800056301
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Sill, G.
(Arizona Univ. Tucson, AZ, United States)
Fink, U.
(Arizona, University Tucson, Ariz., United States)
Ferraro, J. R.
(Argonne National Laboratory Argonne, Ill., United States)
Date Acquired
August 10, 2013
Publication Date
June 1, 1980
Publication Information
Publication: Optical Society of America
Subject Category
Atomic And Molecular Physics
Accession Number
80A40471
Funding Number(s)
CONTRACT_GRANT: NSG-7070
Distribution Limits
Public
Copyright
Other

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