Cooling dynamics of an optically excited molecular probe in solution from femtosecond broadband transient absorption spectroscopy
Cooling dynamics of an optically excited molecular probe in solution from femtosecond broadband transient absorption spectroscopy
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DOI：
10.1063/1.1380696
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发表时间：
2001-08-15
影响因子：
4.4
通讯作者：
Ernsting, NP
中科院分区：
文献类型：
--
作者：
Kovalenko, SA;Schanz, R;Ernsting, NP
对对硝基苯胺（PNA）、二甲胺-对硝基苯胺（DPNA）和反式二苯乙烯（t-二苯乙烯）在溶液中的冷却进行了实验和理论研究。利用泵浦-超连续介质探针（PSCP）技术，观察了飞秒光泵浦诱导热吸收的完整光谱演变过程。在t-stilbene中，热S-1状态是由S-n—>S-1内部转换产生的，特征时间为50 fs。S-1中分子内热化或分子内振动重分布（IVR）的时间常数估计为tau （IVR）。
The cooling of p-nitroaniline (PNA), dimethylamino-p-nitroaniline (DPNA) and trans-stilbene (t-stilbene) in solution is studied experimentally and theoretically. Using the pump-supercontinuum probe (PSCP) technique we observed the complete spectral evolution of hot absorption induced by femtosecond optical pumping. In t-stilbene the hot S-1 state results from S-n-->S-1 internal conversion with 50 fs characteristic time. The time constant of intramolecular thermalization or intramolecular vibrational redistribution (IVR) in S-1 is estimated as tau (IVR)