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A measurement of the vibrational band strength for the upsilon sub 3 band of the HO2 radicalThe HO2 radicals generated in a discharge-flow system were observed with tunable diode laser absorption in the P-branch of the nu(3) vibrationall band at 1080/cm. The observed line positions agree with those calculated from the molecular constants for the nu(3) bland obtained from a previous study using laser magnetic resonance spectroscopy. The band strength was determined by observing line center absoptions when HO2 is produced in the reaction F + H2O2 yields HO2 + HF (k1) with a measured concentration of atomic fluorine and excess hydrogen peroxide. F-atom concentrations are measured by diode laser absorption of the spin-orbit transition at 404/cm. The analysis accounts for HO2 losses due to the reactions of HO2 + HO2 yields H2O2 + O2 (k3) and F + HO2 yields HF + O2 (k4). The line strength for the 6(15) 7(16) F(1) transition is 2.9 x 10 to the 21st power sq cm/molecule/cm which corresponds to a nu(3) band strength of 34 +/- 9 sq/cm(STP atm). This value is a factor of 6 lower than previous ab initio calculations. These results will be useful in assessing the feasibility of atmospheric measurements of HO2 using infrared absorption techniques.
Document ID
19850018625
Acquisition Source
Legacy CDMS
Document Type
Contractor Report (CR)
Authors
Zahniser, M. S.
(Aerodyne Research, Inc. Billerica, MA, United States)
Stanton, A. C.
(Aerodyne Research, Inc. Billerica, MA, United States)
Date Acquired
September 5, 2013
Publication Date
March 1, 1985
Subject Category
Inorganic And Physical Chemistry
Report/Patent Number
NASA-CR-175858
RR-348
NAS 1.26:175858
Accession Number
85N26936
Funding Number(s)
CONTRACT_GRANT: NASW-3607
CONTRACT_GRANT: CMA-FT-81-355
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
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