Photodissociation of CF/sub 2/Br/sub 2/ at 248 nm by the molecular beam method

Journal Article · Thu Sep 27 00:00:00 EDT 1984 · J. Phys. Chem.; (United States)

DOI:https://doi.org/10.1021/j150664a023· OSTI ID:6154921

Krajnovich, D; Zhang, Z; Butler, L; Lee, Y T

The photochemistry of CF/sub 2/Br/sub 2/ at 248 nm has been studied by the crossed laser-molecular beam technique. The only primary reaction channel observed is atomic bromine elimination: CF/sub 2/Br/sub 2/ ..-->.. CF/sub 2/Br + Br. Laboratory angular and time-of-flight distributions of the CF/sub 2/Br and Br primary products were measured and used to derive the center-of-mass (CM) product recoil energy and angular distributions for this reaction. The average CM recoil energy of the products is 21.3 kcal/mol. The shape of the CM angular distribution indicates that the transition dipole moment is polarized parallel to the Br-Br direction in CF/sub 2/Br/sub 2/. The molecular bromine elimination reaction, CF/sub 2/Br/sub 2/ ..-->.. CF/sub 2/ + Br/sub 2/, does not occur to a measurable extent at 248 nm. However, CF/sub 2/ radicals are produced in abundance under collision-free conditions, due to the efficient secondary photodissociation of some of the CF/sub 2/Br primary product.

• Research Organization: Univ. of California, Berkeley, CA (United States)
• DOE Contract Number: AC03-76SF00098
• OSTI ID: 6154921
• Journal Information: J. Phys. Chem.; (United States), Vol. 88:20
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
BROMINATED ALIPHATIC HYDROCARBONS
PHOTOCHEMISTRY
FLUORINATED ALIPHATIC HYDROCARBONS
EXPERIMENTAL DATA
LASER RADIATION
MOLECULAR BEAMS
BEAMS
CHEMISTRY
DATA
ELECTROMAGNETIC RADIATION
HALOGENATED ALIPHATIC HYDROCARBONS
INFORMATION
NUMERICAL DATA
ORGANIC BROMINE COMPOUNDS
ORGANIC COMPOUNDS
ORGANIC FLUORINE COMPOUNDS
ORGANIC HALOGEN COMPOUNDS
RADIATIONS
400500* - Photochemistry