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首页> 外文期刊>Rapid Communications in Mass Spectrometry: RCM >Femtosecond laser time-of-flight mass spectrometry of labile molecular analytes: laser-desorbed nitro-aromatic molecules
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Femtosecond laser time-of-flight mass spectrometry of labile molecular analytes: laser-desorbed nitro-aromatic molecules

机译：飞秒激光飞行时间质谱分析不稳定的分子分析物：激光解吸的硝基芳族分子

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摘要

Femtosecond laser time-of-flight mass spectra of solid samples of trinitrobenzene (TNB), trinitrotoluene (TNT) and trinitrophenol (TNP) have been recorded. Desorption of the solid samples was enacted by the fourth harmonic output (266 nm) of a 5 ns Nd:YAG laser. Subsequent femtosecond post-ionisation of the plume of neutral molecules was achieved using 800 nm laser pulses of 80 fs duration. Mass spectra have been recorded for desorption laser intensities from 2-6 x 10(9) W cm(-2) with ionisation laser intensities between 2 x 10(14) and 6 x 10(15) W cm(-2). Femtosecond laser ionisation has been shown to be capable of generating precursor and characteristic high-mass fragment ions for labile nitro-aromatic molecules commonly used in high-explosive materials. This feature is critical in the future development of femtosecond laser-based analytical instruments that can be used for complex molecular identification and quantitative analysis of environmentally important labile molecules. Furthermore, a comparison of femtosecond post-ionisation mass spectra with standard 70 eV electron impact data has revealed similarities in the spectra and hence the fragmentation processes. Copyright (C) 2001 John Wiley Sons, Ltd. [References: 49]
机译：已记录了三硝基苯（TNB），三硝基甲苯（TNT）和三硝基苯酚（TNP）的固体样品的飞秒激光飞行时间质谱图。固体样品的解吸通过5 ns Nd：YAG激光器的四次谐波输出（266 nm）进行。随后使用80 fs持续时间的800 nm激光脉冲实现了中性分子羽流的飞秒后电离。已记录了解吸激光强度为2-6 x 10（9）W cm（-2）且电离激光强度为2 x 10（14）和6 x 10（15）W cm（-2）之间的质谱图。飞秒激光电离已被证明能够为高爆炸性材料中常用的不稳定的硝基芳族分子生成前体和特征性的高质量碎片离子。此功能对于未来飞秒激光分析仪器的开发至关重要，该仪器可用于复杂分子鉴定和对环境重要的不稳定分子的定量分析。此外，飞秒后电离质谱与标准70 eV电子碰撞数据的比较显示出光谱的相似性，因此也显示了碎片化过程。版权所有（C）2001 John Wiley Sons，Ltd. [参考：49]

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