期刊
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
卷 2, 期 4, 页码 747-756出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/a907905j
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Photodissociation dynamics of CH3Br following excitation in the red wing (240-280 nm) of the (A) over tilde-band absorption are investigated by state-selective resonance enhanced multiphoton ionization probing and photofragment time-of-flight spectroscopy of Br and CH3 products. Evidence of significant methyl fragment rotational excitation is found in the decay channels leading to Br(P-2(3/2)) and to Br*(P-2(1/2)). Vibrational excitation is found in both channels, but is greater, with a population inversion, in that accompanying formation of ground state Br. This latter channel displays an unexpectedly isotropic fragment angular distribution, while the Br* channel has, overall, a parallel angular distribution especially for formation of the lowest upsilon(2) = 0, 1 levels of CH3. These observations are shown to be consistent with a strong non-adiabatic coupling between spin-orbit states of CH3Br with a distortion from C-3v geometry in the interaction region.
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