On the electronic excited state dynamics of vibronic transitions. High resolution electronic spectra of acenaphthene and its argon van der Waals complex in the gas phase.

Published

September 1, 2011

Author(s)

Leonardo Avarez-Valtierra, David F. Plusquellic, John T. Yi, David W. Pratt

Abstract

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 band of the S1 ← S0 transition of ACN exhibits a transition moment orientation parallel to the 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 S2 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 S0 electronic state.

Citation

Journal of Physical Chemistry

Volume

115

Issue

34

Pub Type

Journals

Download Paper

https://doi.org/10.1021/jp1124298

Local Download

Keywords

Herzberg-Teller Coupling, Rotationally Resolved UV Spectroscopy

Citation

Avarez-Valtierra, L. , Plusquellic, D. , Yi, J. and Pratt, D. (2011), On the electronic excited state dynamics of vibronic transitions. High resolution electronic spectra of acenaphthene and its argon van der Waals complex in the gas phase., Journal of Physical Chemistry, [online], https://doi.org/10.1021/jp1124298, https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=907692 (Accessed April 19, 2024)