Wavelength-dependent fragmentation in the resonance-enhanced ionization of bromobenzene

The ionic fragmentation of bromobenzene is studied as a function of excitation energy into the 1B2 state, with two UV photons being necessary to ionize the neutral molecule. A mass-resolved analysis reveals an increase in the C6H+5 /C6H5Br+ ratio at lower excitation energies, which can be traced to...

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Bibliographic Details
Published in:The Journal of chemical physics 1984-12, Vol.81 (11), p.4963-4968
Main Authors: KOPLITZ, B. D, MCVEY, J. K
Format: Article
Language:English
Subjects:
Atomic and molecular physics
Exact sciences and technology
Molecular properties and interactions with photons
Photon interactions with molecules
Physics
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Summary:The ionic fragmentation of bromobenzene is studied as a function of excitation energy into the 1B2 state, with two UV photons being necessary to ionize the neutral molecule. A mass-resolved analysis reveals an increase in the C6H+5 /C6H5Br+ ratio at lower excitation energies, which can be traced to a larger photodissociation cross section for the parent ion. Selected resonant and off-resonant features of the 1B2 state also have been excited. Surprisingly, a slightly smaller phenyl/parent ion ratio is observed for a resonant excitation as compared with an off-resonant excitation. An additional ionization pathway through a triplet state is discussed as a possible explanation of the observed reduction in the phenyl/parent ratio.
ISSN:0021-9606
1089-7690
DOI:10.1063/1.447480