Phase-sensitive molecular ionization induced by a phase-controlled two-color laser field in methyl halides
Phase-sensitive molecular ionization induced by a phase-controlled two-color laser field in methyl halides
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DOI：
10.1103/physreva.74.043410
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发表时间：
2006-10
影响因子：
2.9
通讯作者：
H. Ohmura;F. Ito;M. Tachiya
中科院分区：
文献类型：
--
作者：
H. Ohmura;F. Ito;M. Tachiya
研究了由基频光和二次谐波光组成的相控双色激光脉冲（脉宽130 fs，强度10{sup 12}-10{sup 13} W/cm{sup 2}）诱导的分子相敏光电离过程。在四种卤代甲烷分子（CH{sub 3}X; X=F，Cl，Br，I）的离解电离中，观测到光碎片发射沿激光偏振方向的沿着相位敏感的前后不对称性。在卤素离子和反甲基阳离子中观察到的方向不对称性彼此异相。这一结果表明，检测到的分子的方向与歧视，他们的头和尾顺序。我们表明，在我们的实验条件下，基于分子Ammosov-Delone-Krainov模型的定向分子的选择性电离是主要的过程，而不是动态分子取向的相敏电离过程中卤代甲烷。
We have investigated the phase-sensitive photoionization process of molecules induced by phase-controlled two-color laser pulses consisting of a fundamental light and a second-harmonic light with a pulse duration of 130 fs and an intensity of 10{sup 12}-10{sup 13} W/cm{sup 2}. We observed a phase-sensitive forward-backward asymmetry of photofragment emission along the laser polarization direction in the dissociative ionization of four methyl halide molecules (CH{sub 3}X; X=F,Cl,Br,I). The directional asymmetries observed in the halogen ions and the counter methyl cations were out of phase with each other. This result indicates that detected molecules are oriented with discrimination of their head-and-tail order. We show that under our experimental conditions, selective ionization of oriented molecules based on the molecular Ammosov-Delone-Krainov model is the main process rather than dynamical molecular orientation for the phase-sensitive ionization process in methyl halides.