Action-spectroscopy studies of positively charge-tagged azobenzene in solution and in the gas-phase

The absorption of a positively charge-tagged azobenzene molecule is studied in the gas-phase by measuring photoinduced fragmentation of ions as a function of time. This technique provides information on prompt as well as delayed fragmentation, and a single dissociation channel after one-photon absor...

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Bibliographic Details
Published in:The Journal of chemical physics 2019-02, Vol.150 (8), p.084303-084303
Main Authors: Gruber, Elisabeth, Strauss, Marcel A., Wegner, Hermann A., Andersen, Lars H.
Format: Article
Language:English
Subjects:
Absorption spectra
Band theory
Density functional theory
Fragmentation
Isomerization
Isomers
Light irradiation
Photon absorption
Physics
Spectrum analysis
Time dependence
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Summary:The absorption of a positively charge-tagged azobenzene molecule is studied in the gas-phase by measuring photoinduced fragmentation of ions as a function of time. This technique provides information on prompt as well as delayed fragmentation, and a single dissociation channel after one-photon absorption is identified. The spectra in solution, as well as in the gas-phase, show a weak S0 → S1, a strong S0 → S2, and a broad absorption band in the UV regime. The bands are assigned through time dependent density functional theory calculations. The ratio of the various absorption bands depends on the trans to cis isomerization fraction and may be tuned by light irradiation. Gas-phase absorption spectra are presented and discussed in terms of trans and cis isomers.
ISSN:0021-9606
1089-7690
DOI:10.1063/1.5085743