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Title:High resolution spectroscopy of _x000d_ A1b1u ← x1ag 810410 _x000d_ Band of naphthalene referenced to an optical frequency comb
Author(s):Misono, Masatoshi
Contributor(s):Nishiyama, Akiko; Nakashima, Kazuki
Subject(s):Fundamental interest
Abstract:In the excited vibronic states of naphthalene, there exist various interesting interactions such as intramolecular vibrational energy redistribution (IVR), intersystem crossing (ISC), and internal conversion (IC). More than thirty yeas ago, Beck ${\it et}$ ${\it al}$. showed that IVR became remarkable when the excess energy exceeded about 2000 cm$^{-1}$$^,$ $^a$. In the present study, we observe Doppler-free two-photon absorption spectra of $A^1B_{1u} \leftarrow X^1A_g 8^1_04^1_0$ band of naphthalene around 34281 cm$^{-1}$. The excess energy is 2261 cm$^{-1}$, which is just above the threshold of IVR. Thus we expect this band is suitable to analyze the dynamics in the excited vibronic states. In our experiment, the spectral resolution is about 100 kHz, and rovibronic lines are well-resolved. To decide the transition frequencies, frequency shifts, and spectral linewidths with high accuracy and precision, we employed the comb-referenced Doppler-free two-photon absorption spectroscopic system$^b$. We proceed to assign the rovibronic lines in $^qQ$ transition, and to determine molecular constants in the excited vibronic state. $^a$ S. M. Beck, J. B. Hopkins, D. E. Powers, and R. E. Smalley, J. Chem. Phys. {\bf 74}, 43(1981). $^b$ A. Nishiyama, K. Nakashima, A. Matsuba, and M. Misono, J. Mol. Spectrosc. {\bf 318}, 40 (2015).
Issue Date:2016-06-21
Publisher:International Symposium on Molecular Spectroscopy
Genre:Conference Paper/Presentation
Rights Information:Copyright 2016 by the authors
Date Available in IDEALS:2017-01-26

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