Theoretical investigation of the origin of the multipeak structure of kinetic-energy-release spectra from charge-resonance-enhanced ionization of H{sub 2}{sup +} in intense laser fields
Theoretical investigation of the origin of the multipeak structure of kinetic-energy-release spectra from charge-resonance-enhanced ionization of H{sub 2}{sup +} in intense laser fields
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DOI：
10.1103/physreva.84.033418
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发表时间：
2011-09
影响因子：
2.9
通讯作者：
Hai-Xiang He;R. Lu;Pei-Yu Zhang;Ya-Hui Guo;Keli Han;G. He
中科院分区：
文献类型：
--
作者：
Hai-Xiang He;R. Lu;Pei-Yu Zhang;Ya-Hui Guo;Keli Han;G. He
研究了氢分子离子在强激光脉冲（100 fs，I = 0.77 × 10{sup 14} W/cm{sup 2}~ 2.5 × 10{sup 14} W/cm{sup 2}）中的动力学行为，通过数值求解含时薛定谔方程，计算了库仑爆炸通道的动能释放谱。在最近的实验中，电荷共振增强电离的多峰结构被解释为在临界核距离处的振动“梳”。在计算的库仑爆炸谱中，发现这些峰不是单个振动能级的贡献，而是一些典型振动态的集体贡献，并且主峰随振动能级的增加而向低能区移动，这与实验中的解释也不同.我们还讨论了在相同激光强度下，不同持续时间的质子动能释放谱。
The dynamics of hydrogen molecular ions in intense laser pulses (100 fs, I = 0.77 x 10{sup 14} W/cm{sup 2} to 2.5 x 10{sup 14} W/cm{sup 2}) has been studied, and the kinetic-energy-release spectra of Coulomb explosion channel have been calculated by numerically solving the time-dependent Schroedinger equation. In a recent experiment, a multipeak structure from charge-resonance-enhanced ionization is interpreted by a vibrational 'comb' at a critical nuclear distance. We found that the peaks could not be attributed to a single vibrational level but a collective contribution of some typical vibrational states in our calculated Coulomb explosion spectra, and the main peak shifts toward the low-energy region with increasing vibrational level, which is also different from the explanation in that experiment. We have also discussed the proton's kinetic-energy-release spectra for different durations with the same laser intensity.