Vibronic structures of the ground and first excited electronic states of aromatic hydrocarbons cooled in a supersonic jet

Borisevich, N. A.; Vodovatov, L. B.; D'jachenko, G. G.; Petukhov, V. A.; Semenov, M. A.

doi:10.1117/12.267758

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“…Figure shows the vibrationally resolved fluorescence excitation spectrum of jet-cooled ACN in the gas phase. In agreement with previous results, , we observe that the electronic origin (0 0 0 band) of ACN is red shifted by ∼542 cm –1 from that of NAPH, but is much stronger in relative intensity. , Frequency labels are used to identify the stronger vibronic bands in the spectrum. The group of bands located at 422–434 cm –1 in Figure is close in frequency to the 8̅ 0 1 vibronic band, the strongest band in the spectrum of NAPH, one of which should be the corresponding analog.…”

Section: Resultssupporting

confidence: 91%

On the Excited State Dynamics of Vibronic Transitions. High-Resolution Electronic Spectra of Acenaphthene and Its Argon van der Waals Complex in the Gas Phase

Álvarez-Valtierra

Plusquellic

et al. 2011

J. Phys. Chem. A

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Rotationally resolved fluorescence excitation spectroscopy has been used to study the dynamics, electronic distribution, and the relative orientation of the transition moment vector in several vibronic transitions of acenaphthene (ACN) and in its Ar van der Waals (vdW) complex. The 0(0)(0) band of the S(1) ← S(0) transition of ACN exhibits a transition moment orientation parallel to its a-inertial axis. However, some of the vibronic bands exhibit a transition moment orientation parallel to the b-inertial axis, suggesting a Herzberg-Teller coupling with the S(2) state. Additionally, some other vibronic bands exhibit anomalous intensity patterns in several of their rotational transitions. A Fermi resonance involving two near degenerate vibrations has been proposed to explain this behavior. The high-resolution electronic spectrum of the ACN-Ar vdW complex has also been obtained and fully analyzed. The results indicate that the weakly attached argon atom is located on top of the plane of the bare molecule at ~3.48 Å away from its center of mass in the S(0) electronic state.

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