Selective ionization of oriented nonpolar molecules with asymmetric structure by phase-controlled two-color laser fields.
Selective ionization of oriented nonpolar molecules with asymmetric structure by phase-controlled two-color laser fields.
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DOI：
10.1103/physrevlett.96.173001
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发表时间：
2006-05
影响因子：
8.6
通讯作者：
H. Ohmura;N. Saito;M. Tachiya
中科院分区：
文献类型：
--
作者：
H. Ohmura;N. Saito;M. Tachiya
本文报道了用强度为1.0 × 10 ~（13）W/cm ~（2）（隧道电离区）、脉宽为130 fs的相位控制双色ω +2 ω激光脉冲对具有非对称结构的取向非极性分子进行选择性电离。1-溴-2-氯乙烷的取向是由解离电离的前向-后向发射的方向不对称性来监测的。所观察到的取向方向清楚地证实了分子取向不是由动态取向而是由取向分子的选择性电离引起的，这反映了最高占据分子轨道的结构。这种方法适用于绝大多数分子。
We report on the selective ionization of oriented nonpolar molecules with asymmetric structure by using phase-controlled two-color omega + 2omega laser pulses with an intensity of 1.0 x 10(13) W/cm(2) (tunneling ionization regime) and a pulse duration of 130 fs. The orientation of 1-bromo-2-chloroethane was monitored by the directional asymmetries of the forward-backward emission in dissociative ionization. The observed direction of orientation clearly confirms that molecular orientation is induced not by dynamic orientation but by selective ionization of oriented molecules, which reflects the structure of the highest occupied molecular orbital. This method can be applied for the vast majority of molecules.