Ionisation and fragmentation of polycyclic aromatic hydrocarbons by femtosecond laser pulses at wavelengths resonant with cation transitions
Ionisation and fragmentation of polycyclic aromatic hydrocarbons by femtosecond laser pulses at wavelengths resonant with cation transitions
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DOI：
10.1016/s0009-2614(02)00872-2
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发表时间：
2002-07-10
影响因子：
2.8
通讯作者：
Jamieson, S
中科院分区：
文献类型：
--
作者：
Robson, L;Ledingham, KWD;Jamieson, S
当飞秒（fs）激光脉冲照射碳氢化合物分子时，许多在纳秒照射中明显的破碎通道被绕过，提供了一个强大的分析有用的母离子。然而，许多分子只显示非常小的或实际上没有母离子。最近的论文表明，那些不产生母离子峰的分子在与飞秒激光波长共振时具有阳离子跃迁。这封信表明，这种共振效应不是普遍的，一些芳香分子不仅表现出强烈的母峰，而且当它们的阳离子吸收光谱在800或400 nm或两者都有强烈的共振时，它们还表现出双重和三电离实体。(C) 2002年Elsevier Science B.V.出版
When femtosecond (fs) laser pulses irradiate hydrocarbon molecules, then many fragmentation channels evident in nanosecond irradiation are bypassed, providing a strong analytically useful parent ion, However a number of molecules show only a very small or indeed no parent ions and recent papers suggest that those that do not produce parent peaks have cation transitions in resonance with the femtosecond laser wavelength. This Letter shows that this resonance effect is not universal and some aromatic molecules not only show strong parent peaks but also doubly and triply ionised entities when their cation absorption spectrum is strongly resonant at either the 800 or 400 nm or indeed both. (C) 2002 Published by Elsevier Science B.V.