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Measurement of atmospheric HO by a chemical methodThe parameters for a chemical technique can be outlined from the following set of desirable goals: (1) sufficient conversion of tracer species A to product B that B can be measured quantitatively in the presence of A and a great excess of air; (2) specificity of reaction such that A is converted to B only by reaction with HO; and (3) sufficient sensitivity for detection that the ambient concentration of HO is not seriously perturbed by the presence of A and B. This proposed study involves finding a chemical reaction specific enough for OH, and a measurement of the product formed. What one wants is a rate constant of about 10 to the -10th power cu cm/s, so that 0.1 percent of the OH will be converted in 100 s. Laboratory studies are needed to find a reaction which will fill this bill, yielding a product in quantity sufficient for precise measurement. This is an extremely fast constant and the search may be difficult. Again there is a question of perturbing the local environment, while still providing a sensitive measurement. Also the temperature and pressure dependence of the reaction rate is a complicated function for many of these species (that is, one must use a RRKM or Troe-based picture), and must be taken into account.
Document ID
19870006105
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Iyer, R. Subramonia (California Univ. Irvine, CA, United States)
Rowland, F. Sherwood (California Univ. Irvine, CA, United States)
Date Acquired
September 5, 2013
Publication Date
December 1, 1986
Publication Information
Publication: NASA. Langley Research Center Future Directions for H sub x O sub y Detection
Subject Category
Geophysics
Accession Number
87N15538
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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