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 Title: HIGH-RESOLUTION LASER SPECTROSCOPY OF THE S1 ← S0 TRANSITION OF FLUORENE AND CARBAZOLE Author(s): Kasahara, Shunji Contributor(s): Ueda, Shoya ; Kuroda, Shinji Subject(s): Electronic structure, potential energy surfaces Abstract: Rotationally-resolved high-resolution fluorescence excitation spectra of the $S_{1} \leftarrow S_{0}$ electronic transition of fluorene and carbazole have been observed. Sub-Doppler excitation spectra were measured by crossing a single-mode UV laser beam perpendicular to a collimated molecular beam. The absolute wavenumber was calibrated with accuracy 0.0002 cm$^{-1}$ by measurement of the Doppler-free saturation spectrum of iodine molecule and fringe pattern of the stabilized etalon. For fluorene, 7 bands were observed and analyzed from the $0^0_0$ to $0^0_0+1228$ cm$^{-1}$ band, and their molecular constants were determined with high accuracy. For carbazole, 3 bands were observedand analyzed from the $0^0_0$ to $0^0_0+1122$ cm$^{-1}$ band, and their molecular constants were also determined. Yi {\it et. al.} \footnote{J. T. Yi, L. Alvarez-Valtierra, and D. W. Pratt, {\em J. Chem. Phys.}, {\bf 124}, 244302 (2006).} were reported the lower vibronic bands for both molecules, and their molecular constants are good agreement with the obtained ones except the $0^0_0+204$ cm$^{-1}$ band of fluorene. We found a typical local energy shift in this $0^0_0+204$ cm$^{-1}$ band, and it was identified as originating from the perturbation between the vibronic levels in the $S_{1}$ state. The Zeeman effect were also observed up to 1.2 T for the $0^0_0$ bands to consider the excited state dynamics. Issue Date: 2019-06-19 Publisher: International Symposium on Molecular Spectroscopy Genre: Conference Paper / Presentation Type: Text Language: English URI: http://hdl.handle.net/2142/104417 DOI: 10.15278/isms.2019.WD08 Rights Information: Copyright 2019 Shunji Kasahara Date Available in IDEALS: 2019-07-152020-01-25
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