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首页> 外文期刊>Chemical Physics: A Journal Devoted to Experimental and Theoretical Research Involving Problems of Both a Chemical and Physical Nature >Saturable absorption dynamics in the triplet system and triplet excitation induced singlet fluorescence of some organic molecules
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Saturable absorption dynamics in the triplet system and triplet excitation induced singlet fluorescence of some organic molecules

机译：三重态系统中的饱和吸收动力学和三重态激发引起的某些有机分子的单重态荧光

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摘要

The triplet saturable absorption behaviour of the xanthene dyes eosin Y, erythrosin B, and rose bengal and of the fullerene molecule C_(70) is studied. the molecules are excited to the S_1-state by intense picosecond pulses (wavelength λ_P = 527 nm). They relax dominantly to the triplet system by intersystem crossing. The triplet-triplet saturable absorption is investigated with time-delayed intense picosecond pulses (wavelength λ_L = 1054 nm) in the transparency region of the molecules in the singlet ground state. Higher excited-state triplet absorption cross-sections and higher excited-state triplet relaxation times are determined by numerical simulation of the experimental results. Time-resolved fluorescence measurements reveal higher excited-state triplet to singlet back-intersystem-crossing and multi-step triplet photoionization. Additionally the two-photon absorption cross-sections at λ_L = 1054 nm are determined by measurement of the fundamental pulse two-photon induced fluorescence relative to the second-harmonic pulse single-photon induced fluorescence.
机译：研究了the吨染料曙红Y，赤藓红B和玫瑰红以及富勒烯分子C_（70）的三重态饱和吸收行为。皮秒级脉冲（波长λ_P= 527 nm）将分子激发到S_1状态。它们通过系统间交叉显着地向三联体系统松弛。在单线态基态的分子的透明区域中，通过延时的皮秒脉冲（波长λ_L= 1054 nm）研究了三重态-三重态可饱和吸收。通过实验结果的数值模拟确定较高的激发态三重态吸收截面和较高的激发态三重态弛豫时间。时间分辨的荧光测量显示更高的激发态三重态到单重态背向系统交叉和多步三重态光电离。另外，通过测量相对于二次谐波脉冲单光子诱导的荧光的基本脉冲双光子诱导的荧光来确定在λ_L＝ 1054nm处的双光子吸收截面。

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