One- and two-step double photoionisation processes in valence shells of H2O
One- and two-step double photoionisation processes in valence shells of H2O
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DOI：
10.1088/0953-4075/21/8/011
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发表时间：
1988-04
期刊：
影响因子：
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通讯作者：
D. Winkoun;G. Dujardin;L. Hellner;M. Besnard
中科院分区：
文献类型：
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作者：
D. Winkoun;G. Dujardin;L. Hellner;M. Besnard
研究了在34-50 eV范围内的光子能量在H2O中的解离双光电离过程。观察到H++OH+形成的两个碎裂通道和解离成三个碎片（O++H++H）。通过使用光离子-光离子符合（PIPICO）方法测量在这些过程中的每一个中释放的总动能。在34.4和37.1 eV处测量的前两个过程的出现能量远低于在39.2 eV处计算的形成H2 O2+的最低垂直能量。至少在34.4 eV的过程被认为是最有可能由于两步双电离。
Dissociative double photoionisation processes in H2O are investigated for photon energies in the 34-50 eV range. Two fragmentation channels for formation of H++OH+ and a dissociation into three fragments (O++H++H) are observed. The total kinetic energy released in each of these processes is measured by using the photoion-photoion coincidence (PIPICO) method. The appearance energies of the first two processes measured at 34.4 and 37.1 eV are well below the lowest vertical energy for formation of H2O2+ calculated at 39.2 eV. At least the process at 34.4 eV is considered to be most probably due to two-step double ionisation.