Visible and UV multiphoton ionization and fragmentation of polyatomic molecules
Visible and UV multiphoton ionization and fragmentation of polyatomic molecules
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多原子分子的可见光和紫外多光子电离和碎裂
DOI：
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发表时间：
1980
期刊：
影响因子：
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通讯作者：
E. W. Schlag
中科院分区：
文献类型：
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作者：
U. Boesl;H. Neusser;E. W. Schlag
现在已经知道，可调谐染料激光通过多光子吸收导致质谱仪中分子的共振增强光电离。在某些情况下，这一过程还会导致离子碎裂。利用不同波长的延时串列激光脉冲研究了苯中多光子电离破碎过程的机理。实验结果强烈地表明，激发并不是沿着中性分子的自电离阶梯向上进行的，而多光子过程是由于两个独立的阶梯向上攀登而引起的，一个是沿着中性分子的电离势向上攀登，另一个是沿着产生的新种类的分子母离子向上攀登。因此，多光子电离也可以成为离子光谱学的新基础。
It is now known that tunable dye laser light leads to resonance enhanced photoionization of molecules in a mass spectrometer via multiphoton absorption. In some cases this process also leads to ion fragmentation. Time delayed tandem laser pulses of different wavelengths are employed to study the mechanism of this multiphoton ionization and fragmentation process in benzene. The experimental results strongly indicate that excitation does not proceed up an autoionization ladder of the neutral molecule, rather the multiphoton process is shown to be due to the climbing of two independent ladders, one up to the ionization potential in the neutral molecule, the second in the new species of molecular parent ions produced. Hence multiphoton ionization could also form a new basis of ion spectroscopy.