In:
MATEC Web of Conferences, EDP Sciences, Vol. 209 ( 2018), p. 00006-
Abstract:
Electronically excited oxygen has an important place in the kinetic schemes of the processes taking place in the atmosphere, in the active medium of an oxygen-iodine laser, and in plasma-assisted combustion 1 . Over the past decades, a large amount of data on the rate constants of quenching O 2 (b) on a large number of collision partners has been accumulated. However, they mostly refer to the results of measurements at room temperature. In this paper, rate constants for the quenching of O 2 (b) by collisions with N 2 O, NO, and CH 4 have been determined in the temperature range from 297 to 800 K, by the laser-induced fluorescence method. O 2 (b) was excited by pulses from a tunable dye laser, and the deactivation kinetics were followed via observing the temporal behavior of the b 1 Σg + → X 3 Σg - fluorescence. From the analysis of experimental results, the following temperature dependencies of the quenching rate constants by these gases were obtained, and could be represented by the expressions: kNO=(1.77±0.2)×10 -24 × T 3.5 exp (1138±37/ T ); kN 2 O=(2.63±0.14)×10 -16 ×T 1.5 ×exp(590±26/T) and kCH 4 =(3.54±0.4)×10 -18 ×T 1.5 ×exp(-220±24/T) cm 3 s -1 . All of the rate constants measured at room temperature were found to be in good agreement with previously reported values.
Type of Medium:
Online Resource
ISSN:
2261-236X
DOI:
10.1051/matecconf/201820900006
Language:
English
Publisher:
EDP Sciences
Publication Date:
2018
detail.hit.zdb_id:
2673602-0
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