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Experimental measurement of the rate of the reaction o(3P) + H2(v = 0) → OH(v = 0) + H at T = 298 K

✍ Scribed by Glenn C. Light; James H. Matsumoto

Publisher
John Wiley and Sons
Year
1980
Tongue
English
Weight
898 KB
Volume
12
Category
Article
ISSN
0538-8066

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✦ Synopsis

Measurement of the rate of the reaction (1) o ( 3 ~) + H ~( ~ = 0) -+ OH(^ = 0 ) + H

is reported. The measurements were made in a flow tube apparatus. The result is based on data for the absolute density of OH(u = 0) obtained from laser-induced fluorescence measurements in the (0-0) hand of the O H ( A 2 Z + -X211) system. The density of oxygen atoms was varied by changing the flow rate of NO which is consumed in the reaction N + NO -0 + Nz. We find that kl(298 K) = (5.5 f 3.0) X lo6 cm3/mol sec. This result was obtained with consideration and control of the effect of reaction (2):

(2)

for which vibrationally excited hydrogen is created by energy transfer in the presence of active nitrogen. It was found that the addition of Nz or COz effectively suppressed the excitation of Hz(u = 1). Measurements of the density of Hz(u = 1) were made by VUV absorption in the Lyman hand system of Hs. All of the reports of low-temperature measurements and some recent theoretical calculations for k 1 are discussed. The present result confirms and extends the growing evidence for significant curvature in the low-temperature end of a modified Arrhenius plot of kl(T).

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