使用激光产生的真空紫外光子的单光子电离质谱法

Laser Chemistry Pub Date : 1900-01-01 DOI:10.1155/1997/53174
N. Lockyer, J. Vickerman
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引用次数: 47

摘要

本文综述了单光子电离质谱分析方法。本文综述了各向同性介质中三阶四波和混频上变频的理论和三倍频355nm Nd:YAG泵浦源产生三次谐波的实验结果。在丙酮电离室中检测波长为118纳米的真空紫外(VUV)光子。本文的重点是在质谱计离子源中产生和检测VUV光子并将其用于单光子电离(SPI)的实际方面。确定了在Xe和Xe/Ar混合物中THG的最佳气体压力。对于具有良好模态结构的泵梁,其最优气体压力与理论值非常吻合。主要损失机理是三倍化气体对VUV的再吸收。已经给出了己烷和生物分子缬氨酸的SPI质谱,说明了该技术的力量。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
SINGLE PHOTON IONISATION MASS SPECTROMETRY USING LASER-GENERATED VACUUM ULTRAVIOLET PHOTONS
This paper provides an overview of the method of single photon ionisation mass spectrometry. A review of the theory of frequency upconversion using third-order 4- wave sum mixing in isotropic media and experimental results of third harmonic generation (THG) using a frequency tripled 355 nm Nd:YAG pump source are presented. Vacuum Ultra-violet (VUV) photons of wavelength 118 nm are detected in an acetone ionisation chamber. The emphasis of this paper is on the practical aspects of generating and detecting the VUV photons and using them for single photon ionisation (SPI) in the ion source of a mass spectrometer. Optimum gas pressures for THG in Xe and Xe/Ar mixtures are established. For a pump beam of well defined mode structure the optimum gas pressures are in excellent agreement with theory. The major loss mechanism is attributed to re-absorption of VUV by the tripling gas. SPI mass spectra of hexane and the biomolecule valyl-valine are presented illustrating the power of the technique.
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