Deperasińska I, Zehnacker A, Lahmani F, Borowicz P, Sepioł J
Institute of Physics, Polish Academy of Sciences, Al. Lotników 32/46, 02-668 Warsaw, Poland.
J Phys Chem A. 2007 May 24;111(20):4252-8. doi: 10.1021/jp070337o. Epub 2007 Apr 21.
Jet-cooled terrylene has been studied in helium buffer gas using a pulsed nozzle by means of laser-induced fluorescence. Fluorescence excitation and two-color depletion experiments (resulting in hole burning spectra) are presented. Analysis of the spectra leads to the conclusion that another excited electronic state is present in the vicinity of the allowed 1B1u state. Assuming (according to previous literature suggestions Karabunarliev, S.; Baumgarten, M.; Müllen, K. J. Phys. Chem. A 1998, 102, 7029) that this dark state is the 21Ag state, we discuss the vibrational structure of the fluorescence excitation spectrum in terms of two manifolds of vibronic states belonging to Sd(21Ag) and S1(1B1u) states. The anomalous shift between excitation and dispersed fluorescence spectra observed earlier for terrylene in a neon matrix is discussed as a consequence of terrylene electronic relaxation to the low-energy dark state.
利用脉冲喷嘴，通过激光诱导荧光技术，在氦缓冲气体中对喷射冷却的苝进行了研究。给出了荧光激发和双色耗尽实验（得到烧孔光谱）。光谱分析得出结论，在允许的1B1u态附近存在另一个激发电子态。假设（根据之前文献的建议，卡拉布纳利耶夫，S.；鲍姆加滕，M.；米伦，K.《物理化学杂志A》1998年，102卷，7029页）这个暗态是21Ag态，我们根据属于Sd(21Ag)和S1(1B1u)态的两个电子振动态流形来讨论荧光激发光谱的振动结构。讨论了早期在氖基质中观察到的苝激发光谱和色散荧光光谱之间的异常位移，这是苝电子弛豫到低能暗态的结果。
