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

Autor:	John T. Yi, David F. Plusquellic, Leonardo Alvarez-Valtierra, David W. Pratt
Rok vydání:	2011
Předmět:	Chemistry Transition dipole moment symbols.namesake Vibronic coupling Excited state Atom Physics::Atomic and Molecular Clusters symbols Vibronic spectroscopy Center of mass Fermi resonance Physical and Theoretical Chemistry van der Waals force Atomic physics
Zdroj:	The Journal of Physical Chemistry A. 115:9557-9566
ISSN:	1520-5215 1089-5639
DOI:	10.1021/jp1124298
Popis:	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.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_dedup___::ac771f10ab9606aa203593026d245f50 https://doi.org/10.1021/jp1124298