Publication Date:
2016-01-01
Description:
We report vibrationally resolved spectra of the S 1 ←S 0 transition of bromobenzene using resonance-enhanced multiphoton ionization spectroscopy. We study bromobenzene- h 5 as well as its perdeuterated isotopologue, bromobenzene- d 5 . The form of the vibrational modes between the isotopologues and also between the S 0 and S 1 electronic states is discussed for each species, allowing assignment of the bands to be achieved and the activity between states and isotopologues to be established. Vibrational bands are assigned utilizing quantum chemical calculations, previous experimental results, and isotopic shifts. Previous work and assignments of the S 1 spectra are discussed. Additionally, the vibrations in the ground state cation, D 0 + , are considered, since these have also been used by previous workers in assigning the excited neutral state spectra. We also examine the vibrations of iodobenzene in the S 0 and D 0 + states and comment on the previous assignments of these. In summary, we have been able to assign the corresponding vibrations across the whole monohalobenzene series of molecules, in the S 0 , S 1 , and D 0 + states, gaining insight into vibrational activity and vibrational couplings.
Print ISSN:
0021-9606
Electronic ISSN:
1089-7690
Topics:
Chemistry and Pharmacology
,
Physics
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