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首页> 外文期刊>Physical chemistry chemical physics: PCCP >Dynamics of electronically excited states in the eumelanin building block 5,6-dihydroxyindole
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Dynamics of electronically excited states in the eumelanin building block 5,6-dihydroxyindole

机译：Eumelanin构建块中电子激发态的动态5,6-二羟基吲哚

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摘要

We report the first excited state dynamics study of gas-phase 5,6-dihydroxyindole (5,6-DHI), a key building block of eumelanin pigments that are found throughout nature and serve as important photo-protective compounds. Time-resolved ion-yield measurements over the 241-296 nm ultraviolet photoexcitation region revealed non-adiabatic processes occurring on up to three distinct timescales. These reflect ultrafast (i.e. sub-picosecond) internal conversion within the excited state singlet manifold, and much longer-lived processes ranging from 10 ps to in excess of 1 ns. Our investigation paves the way for precisely targeted future studies of 5,6-DHI that exploit more differential measurement techniques. The work was facilitated by the use of soft laser-based thermal desorption to introduce 5,6-DHI samples into the gas phase. This approach, based on low-cost, readily available diode lasers, is straightforward, easily controllable and potentially applicable to a wide range of non-volatile molecular species.
机译：我们报告了燃气相5,6-二羟基吲哚（5,6-型）的第一个激发态动力学研究，该研究在整个性质上发现了eumelanin颜料的关键构建块，并用作重要的光保护化合物。在241-296nm紫外线透射区域上的时间分辨离子产量测量显示出现在最多三个不同时间尺寸的非绝热过程。这些反映了超速度（即次皮秒）内部转换，在激发状态单线形内部转换，更长寿的过程范围为10 pe至超过1ns。我们的调查为精确定位的5,6-DHI进行了精确定位的未来研究，该方法利用了更差分测量技术。通过使用软激光的热解吸来促进该工作，以将5,6-DHI样品引入气相中。基于低成本，易于使用的二极管激光器的这种方法很简单，易于控制，并且可能适用于各种非挥发性分子种类。

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