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

Valérie Blanchet (1) , Peter C. Samartzis (2) , Alec M. Wodtke (2)

1 Femto (LCAR)
2 CCS-UCSB - Chemistry and Biochemistry [Santa Barbara]

We employ the velocity map imaging technique to measure kinetic energy and angular distributions of state selected CH3 (v2=0,1,2,3) and Br (2P3/2,2P1/2) 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 excitation of the umbrella mode of the methyl fragment. Low energy structured features appear on the images which arise from CH3Br+ photodissociation near 330 nm. The excess energy of the probe laser photon is channeled into CH3+ vibrational excitation, most probably in the nu_4 degenerate bend

Mots clés: metly bromide; photodissociation imaging; REMPI of CH3

Domaines: Chimie-Physique [physics.chem-ph]

Valérie Blanchet, Peter C. Samartzis, Alec M. Wodtke. UV photodissociation of methyl bromide and methyl bromide cation studied by velocity map imaging. Journal of Chemical Physics, 2009, 130, pp.034304. ⟨10.1063/1.3058730⟩. ⟨hal-00354806⟩