Gas-phase atom-radical kinetics of atomic hydrogen reactions with CF sub 3 , CF sub 2 and CF radicals

Journal Article · Thu Mar 23 04:00:00 EST 1989 · Journal of Physical Chemistry; (USA)

DOI:https://doi.org/10.1021/j100343a048· OSTI ID:5061421

Tsai, Chengping; McFadden, D L ^[1]

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1. Boston College, Chestnut Hill, MA (USA)

The absolute rate constants for the reactions of atomic hydrogen with CF{sub 3}, CF{sub 2}, and CF radicals have been measured in a gas flow system with photoionization mass spectrometry detection. CF{sub 3}, CF{sub 2}, and CF were produced by dissociation of CF{sub 3}Br, CF{sub 2}HCl, and CH{sub 2}FCl, respectively, in a radio frequency discharge. H atoms were produced by dissociation of the elemental gas in a microwave discharge. The pressure was 1.7 Torr. The rate constants at 293 K in units of cm{sup 3} molecule{sup {minus}1} s{sup {minus}1} are (9.1 {plus minus} 1.5) {times} 10{sup {minus}11} for CF{sub 3} + H, (3.9 {plus minus} 0.7) {times} 10{sup {minus}11} for CF{sub 2} + H, and (1.9 {plus minus} 0.3) {times} 10{sup {minus}11} for CF + H. Hydrogen fluoride was detected as the principal stable product in all three reactions. The mechanism of fluorine atom abstraction is discussed.

• OSTI ID: 5061421
• Journal Information: Journal of Physical Chemistry; (USA), Journal Name: Journal of Physical Chemistry; (USA) Vol. 93:6; ISSN 0022-3654; ISSN JPCHA
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400500* -- Photochemistry
54 ENVIRONMENTAL SCIENCES
540110
BROMINATED ALIPHATIC HYDROCARBONS
CHEMICAL REACTION YIELD
CHEMICAL REACTIONS
CHLORINATED ALIPHATIC HYDROCARBONS
DATA
ELECTROMAGNETIC RADIATION
ELEMENTS
EXPERIMENTAL DATA
FLOW RATE
FLUIDS
FLUORINATED ALIPHATIC HYDROCARBONS
GASES
HALOGENATED ALIPHATIC HYDROCARBONS
HYDROFLUORIC ACID
HYDROGEN
HYDROGEN COMPOUNDS
INFORMATION
INORGANIC ACIDS
IONIZATION
LOW PRESSURE
MASS SPECTROSCOPY
MEDIUM TEMPERATURE
MICROWAVE RADIATION
NONMETALS
NUMERICAL DATA
ORGANIC BROMINE COMPOUNDS
ORGANIC CHLORINE COMPOUNDS
ORGANIC COMPOUNDS
ORGANIC FLUORINE COMPOUNDS
ORGANIC HALOGEN COMPOUNDS
PHOTOCHEMICAL REACTIONS
PHOTOIONIZATION
RADIATIONS
RADICALS
RF SYSTEMS
SPECTROSCOPY
YIELDS