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首页> 外文期刊>The journal of physical chemistry, A. Molecules, spectroscopy, kinetics, environment, & general theory >Valence electron ionization dynamics of chromium by a photoelectron imaging technique: J~+-dependent state and angular distribution
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Valence electron ionization dynamics of chromium by a photoelectron imaging technique: J~+-dependent state and angular distribution

机译：铬的价电子电离动力学的光电子成像技术：J〜+依赖状态和角度分布

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摘要

The photoionization of Cr at excited states is investigated using a velocity-map photoelectron imaging technique. Benzene chromium carbonyl or bis(η~6- benzene) chromium was used as a precursor for the generation of excited Cr atoms. The a ~5S_2 → x ~5P _3 and a ~5D_3 → y ~5D _2 transitions are then employed for the preparation of resonant intermediate states in a two-color two-photon ionization process, in which an electronic configurational change from 3d~4(~5D)4s4p(~1P) to 3d~44s(~6D _(J+)) occurs. The photoelectron kinetic energy distribution is found to be very sensitive to the ionization energy and the total angular momentum quantum number of the chromium ion (J~+). Anisotropy parameters associated with departing electrons also show significant variation depending on the energy and total angular momentum quantum number, suggesting that direct and/or indirect ionization should be quantum-mechanically mixed, manifesting the complicated nature of angular momentum couplings in the ionization continuum.
机译：使用速度图光电子成像技术研究了在激发态下Cr的光电离。苯羰基铬或双（η-6-6苯）铬被用作生成激发Cr原子的前体。然后使用a〜5S_2→x〜5P _3和〜5D_3→y〜5D _2跃迁来制备双色双光子电离过程中的共振中间态，其中电子构型从3d〜4变化（〜5D）4s4p（〜1P）至3d〜44s（〜6D _（J +））发生。发现光电子动能分布对电离能和铬离子的总角动量量子数（J〜+）非常敏感。与离开的电子相关的各向异性参数也显示出显着的变化，这取决于能量和总角动量量子数，这表明直接和/或间接电离应进行量子机械混合，从而体现出电离连续体中角动量耦合的复杂性质。

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