Gas-phase atom-radical kinetics of atomic hydrogen, nitrogen, and oxygen reactions with CHF reactions

The absolute rate constants for the reactions of atomic hydrogen, nitrogen, and oxygen with CHF radicals have been measured in a gas-flow system with photoionization mass spectrometry detection. Atomic reactants were produced by dissociation of the corresponding elemental gas in a microwave discharg...

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Bibliographic Details
Published in:Journal of physical chemistry (1952) 1990-04, Vol.94:8
Main Authors: Tsai, Cheng-ping, McFadden, D.L.
Format: Article
Language:English
Subjects:
400200 - Inorganic, Organic, & Physical Chemistry
CHEMICAL REACTION KINETICS
DATA
DATA ANALYSIS
ELEMENTS
EXPERIMENTAL DATA
GAS ANALYSIS
HYDROGEN
INFORMATION
INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY
KINETICS
MEASURING INSTRUMENTS
MEASURING METHODS
NITROGEN
NONMETALS
NUMERICAL DATA
ORGANIC COMPOUNDS
ORGANIC FLUORINE COMPOUNDS
ORGANIC HALOGEN COMPOUNDS
OXYGEN
REACTION KINETICS
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Summary:The absolute rate constants for the reactions of atomic hydrogen, nitrogen, and oxygen with CHF radicals have been measured in a gas-flow system with photoionization mass spectrometry detection. Atomic reactants were produced by dissociation of the corresponding elemental gas in a microwave discharge. The pressure was 1.7 Torr. The rate constants for CHF decay under pseudo-first-order conditions at 293 K in units of cm{sup 3} molecule{sup {minus}1} s{sup {minus}1} are (4.9 {plus minus} 0.9) {times} 10{sup {minus}10} for CHF + H, (2.4 {plus minus} 0.4) {plus minus} {times} 10{sup {minus}11} for CHF + N, and (1.4 {plus minus} 0.2) {times} 10{sup {minus}10} for CHF + O. These reactions appear to proceed by an association-elimination mechanism.
ISSN:0022-3654
1541-5740
DOI:10.1021/j100371a017