High-resolution And High-precision Laser Spectroscopy Of A-benzanthracene

Baba, Masaaki

Permalink

https://hdl.handle.net/2142/111225 Copy

Description

Title

High-resolution And High-precision Laser Spectroscopy Of A-benzanthracene

Author(s)

Baba, Masaaki

Contributor(s)

• Misono, Masatoshi
• Nishiyama, Akiko
• Yamasaki, Sho

Issue Date

2021-06-22

Keyword(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.

Publisher

International Symposium on Molecular Spectroscopy

Type of Resource

Text

Language

eng

Permalink

http://hdl.handle.net/2142/111225

DOI

10.15278/isms.2021.TD10

Owning Collections