Electronic Spectroscopy of cis- and trans-meta-Vinylbenzyl Radicals
نویسندگان
چکیده
The D0(2A?)–D1(2A?) electronic transition of resonance-stabilized radical C9H9 isomers cis- and trans-meta-vinylbenzyl (MVB) has been investigated using resonant two-color two-photon ionization (R2C2PI) laser-induced fluorescence. radicals were produced in a discharge m-vinyltoluene diluted Ar probed under jet-cooled conditions. origin bands the cis trans conformers are at 19 037 18 939 cm–1, respectively. Adiabatic energies near 7.17 eV determined for both from ion-yield scans. Dispersed fluorescence (DF) was used to conclusively identify cis-conformer: ground-state cis-MVB eigenvalues calculated Fourier series fit computed vinyl torsion potential excellent agreement with torsional transitions cm–1 DF spectrum. R2C2PI features arising or trans-MVB distinguished by optical–optical hole-burning spectroscopy vibronic assignments made guidance density functional theory (DFT) time-dependent (TDDFT) calculations. There is notable absence mirror symmetry between excitation emission spectra several totally symmetric modes, whereby modes that conspicuous nearly absent excitation, vice versa. This effect largely ascribed interference Franck–Condon Herzberg–Teller contributions moment, its pervasiveness consequence low (Cs) molecule, which permits intensity borrowing relatively bright states A? symmetry.
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ژورنال
عنوان ژورنال: Journal of Physical Chemistry A
سال: 2021
ISSN: ['1089-5639', '1520-5215']
DOI: https://doi.org/10.1021/acs.jpca.1c04496