Photoionization of hot radicals: C2H5, n-C3H7, and i-C3H7.
Photoionization of hot radicals: C2H5, n-C3H7, and i-C3H7.
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DOI：
10.1063/1.2110225
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发表时间：
2005-11
期刊：
影响因子：
--
通讯作者：
H. Fan;Stephen T. Pratt
中科院分区：
文献类型：
--
作者：
H. Fan;Stephen T. Pratt
利用离子成像和真空紫外单光子电离相结合的方法，研究了碘代烷在266 nm光解离后，C（2）H（5），n-C（3）H（7）和i-C（3）H（7）自由基的相对光电离产率与内能的关系.通过自由基的真空紫外光电离获得的离子图像与通过互补I（2）P（32）和I*（2）P（12）原子的双光子共振、三光子电离获得的离子图像的比较允许提取截面的内部能量依赖性。讨论了不同探测通道中离子像出现的影响因素，包括中性自由基的二次碎裂、光电离过程的Franck-Condon因子和母体光离子的单分子碎裂。
The combination of ion-imaging and vacuum-ultraviolet (vuv) single-photon ionization is used to study the internal energy dependence of the relative photoionization yields of the C(2)H(5),n-C(3)H(7), and i-C(3)H(7) radicals following the 266 nm photodissociation of the corresponding alkyl iodides. The comparison of the ion images obtained by vuv photoionization of the radical with those obtained by two-photon-resonant, three-photon ionization of the complementary I (2)P(32) and I*(2)P(12) atoms allows the extraction of the internal energy dependence of the cross sections. Factors influencing the appearance of the ion images in the different detection channels are discussed, including the secondary fragmentation of the neutral radicals, Franck-Condon factors for the photoionization process, and the unimolecular fragmentation of the parent photoions.