Abstract

The internal energy dynamics of three examples of PAHs are probed using a high resolution energy time of flight spectrometer. The measured H-loss rates are converted to internal energy values for a range of UV photon wavelengths. Multi step multi photon absorption scheme is proposed to estimate the possible internal energy values with reasonable accuracies. This was possible because of the ultrafast radiationless internal conversion process in PAHs and their structural rigidity. Thus, a method is proposed to produce PAH cations with narrow and known internal energy distribution using a single nanosecond pulsed laser, paving a way to study statistical unimolecular decay in PAHs very efficiently.

Graphical abstract

中文翻译：

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使用单纳秒脉冲激光生产内部能量分布窄的PAH阳离子

摘要

使用高分辨率能量飞行时间光谱仪探测了三个PAH实例的内部能量动力学。对于一定范围的紫外线光子波长，将测得的H损耗率转换为内部能量值。提出了一种多步多光子吸收方案，以合理的精度估算可能的内部能量值。由于PAH的超快无辐射内部转换过程及其结构刚度，这之所以成为可能。因此，提出了一种使用单纳秒脉冲激光产生具有狭窄且已知内部能量分布的PAH阳离子的方法，从而为非常有效地研究PAHs的统计单分子衰变铺平了道路。

图形概要