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Absolute intensity measurements for the 2·7 μ band of water vapor in a shock tube

Patch, R. W. (1965) Absolute intensity measurements for the 2·7 μ band of water vapor in a shock tube. Journal of Quantitative Spectroscopy and Radiative Transfer, 5 (1). pp. 137-164. ISSN 0022-4073. http://resolver.caltech.edu/CaltechAUTHORS:20110103-085202868

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Abstract

The apparent spectral absorption coefficients of the H_20 infrared bands in the vicinity of 2·7 µ were measured in a shock tube behind reflected shock waves in an Ar-H_20 mixture. By interrupting an infrared beam at a 60 kc rate and projecting this beam across the shock tube to a monochromator, it was possible to measure simultaneously both emission and absorption of H_20 at 1000°K. The spectral absorption coefficients obtained from emission measurements averaged 9·8 per cent higher than absorption coefficients obtained from absorption measurements, probably due to experimental errors (smaller than usually encountered in shock tube measurements). At 1933°K experimental difficulties precluded simultaneous measurement of infrared emission and absorption, so measurements were restricted to emission. The apparent absorption coefficients were integrated to give the integrated absorption coefficients for the collection of bands near 2·7 µ. Integrated absorption coefficients were 49·8 cm^(-2) atm^(-1), 54·7 cm^(-2) atm^(-1), and 31·6 cm^(-2) atm^(-1) for absorption at 1000°K, emission at 1000°K, and emission at 1933°K, respectively. The two values at 1000°K were in good agreement with those of Goldstein, who made no measurements above this temperature.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1016/0022-4073(65)90038-5DOIUNSPECIFIED
Additional Information:© 1965 Pergamon Press Ltd. Available online 31 July 2002. The study was supported by the Air Force Office of Scientific Research Grant No. AF-AFOSR-7163. The author is indebted to Professor S. S. Penner for helpful discussions during the course of this work.
Group:Guggenheim Jet Propulsion Center
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Air Force Office of Scientific Research (AFOSR) AF-AFOSR-7163
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Guggenheim Jet Propulsion CenterUNSPECIFIED
Record Number:CaltechAUTHORS:20110103-085202868
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20110103-085202868
Official Citation:Absolute intensity measurements for the 2·7 μ band of water vapor in a shock tube. Pages 137-164 R.W. Patch
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:21524
Collection:CaltechAUTHORS
Deposited By: Ruth Sustaita
Deposited On:07 Jan 2011 17:50
Last Modified:26 Dec 2012 12:47

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