Absolute two-photon ionization yields for selected organic molecules at 248 nm
Absolute two-photon ionization yields for selected organic molecules at 248 nm
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所选有机分子在 248 nm 处的绝对双光子电离产率
DOI：
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发表时间：
1985
期刊：
影响因子：
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通讯作者：
D. Eckstrom
中科院分区：
文献类型：
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作者：
W. Bischel;L. Jusinski;M. Spencer;D. Eckstrom
在248nm处测量了苯、氟苯、二乙基苯胺和三甲胺的绝对双光子电离产率，作为KrF激光在大约8和20nsec两个脉冲长度下的函数。我们还研究了226和193 nm处的NO电离产率。电离是一个共振过程，可以建模为一个四能级系统。从这些数据中，我们得到了基态吸收截面、中间态电离截面和有效中间态寿命。在某些情况下，直接非共振双光子过程对电离产率的贡献很小，可以从模型中推断出来。
Absolute two-photon ionization yields for benzene, fluorobenzene, diethylaniline, and trimethylamine have been measured at 248 nm as a function of KrF laser fluence for two pulse lengths of approximately 8 and 20 nsec. We have also investigated NO ionization yields at 226 and 193 nm. The ionization is a resonant process that can be modeled as a four-level system. From the data, we derive ground-state absorption cross sections, intermediate-state ionization cross sections, and effective intermediate-state lifetimes. In some cases, a small contribution to the ionization yield from a direct nonresonant two-photon process can be inferred from the model.