UV photodissociation of methyl bromide and methyl bromide cation studied by velocity map imaging

Journal Article · Tue Jan 20 23:00:00 EST 2009 · Journal of Chemical Physics

DOI:https://doi.org/10.1063/1.3058730· OSTI ID:21255375

Blanchet, Valerie ^[1]; Samartzis, Peter C; Wodtke, Alec M ^[2]

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1. Laboratoire Collisions Agregats Reactivite, IRSAMC, Universite de Toulouse, UPS, F-31062 Toulouse (France)
2. Department of Chemistry and Biochemistry, University of California, Santa Barbara, California 93106 (United States)

We employ the velocity map imaging technique to measure kinetic energy and angular distributions of state selected CH{sub 3} (v{sub 2}=0,1,2,3) and Br ({sup 2}P{sub 3/2}, {sup 2}P{sub 1/2}) photofragments produced by methyl bromide photolysis at 215.9 nm. These results show unambiguously that the Br and Br* forming channels result in different vibrational excitations of the umbrella mode of the methyl fragment. Low energy structured features appear on the images, which arise from CH{sub 3}Br{sup +} photodissociation near 330 nm. The excess energy of the probe laser photon is channeled into CH{sub 3}{sup +} vibrational excitation, most probably in the {nu}{sub 4} degenerate bend.

• OSTI ID: 21255375
• Journal Information: Journal of Chemical Physics, Journal Name: Journal of Chemical Physics Journal Issue: 3 Vol. 130; ISSN JCPSA6; ISSN 0021-9606
• Country of Publication: United States
• Language: English

Related Subjects

74 ATOMIC AND MOLECULAR PHYSICS
ANGULAR DISTRIBUTION
BROMINE IONS
CATIONS
DISSOCIATION
EXCITATION
EXCITED STATES
IMAGES
KINETIC ENERGY
MAPS
METHYL BROMIDE
PHOTOLYSIS
PHOTON-MOLECULE COLLISIONS
PHOTONS
REACTION KINETICS
VELOCITY