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Title:High-resolution And High-precision Laser Spectroscopy Of A-benzanthracene
Author(s):Baba, Masaaki
Contributor(s):Misono, Masatoshi; Nishiyama, Akiko; Yamasaki, Sho
Subject(s):Fundamental interest
Abstract:The electronic excited states of polycyclic aromatic hydrocarbons (PAHs) are especially interesting and high-resolution laser spectroscopy is very powerful to elucidate molecular structure and excited-state dynamics. We observed and analyzed the high-resolution and high-precision spectrum of the S$_1$ $\leftarrow$ S$_0$ 0-0 band of jet-cooled a-benzanthracene using a single-mode laser system precisely controlled by optical frequency comb \footnote{A. Nishiyama, K. Nakashima, A. Matsuba, and M. Misono, J. Mol. Spectrosc {\bf 318}, 40 (2010).}. There are two candidates for the S$_1$ state of planar PAHs with high symmetry such as naphthalene and anthracene, $\Psi_A$ ( HOMO $\rightarrow$ LUMO : strong transition and short fluorescence lifetime ) and $\Psi_B$ ( HOMO $\rightarrow$ LUMO+1 and HOMO$-$1 $\rightarrow$ LUMO : weak transition and long fluorescence lifetime ) \footnote{M. Baba, T. Katori, M. Kawabata, S. Kunishige, and T. Yamanaka, J. Phys. Chem. A {\bf 117}, 13524 (2013).}. The S$_1$ states of naphthalene and zigzag catacondenced PAHs are well expressed by $\Psi_B$, but The S$_1$ states of anthracene and linear catacondenced PAHs show typical properties of $\Psi_A$, srong fluorescence and short-lived. It is concluded that the S$_1$ state of a-benzanthracene is the mixture of $\Psi_A$ and $\Psi_B$ and shows an intermediate property because of its low symmetry.
Issue Date:2021-06-22
Publisher:International Symposium on Molecular Spectroscopy
Genre:Conference Paper / Presentation
Type:Text
Language:English
URI:http://hdl.handle.net/2142/111225
Date Available in IDEALS:2021-09-24


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