Excitation and ionization of molecular hydrogen by ultrashort vuv laser pulses
Excitation and ionization of molecular hydrogen by ultrashort vuv laser pulses
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DOI：
10.1103/physreva.75.013408
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发表时间：
2007-01
影响因子：
2.9
通讯作者：
A. Palacios;H. Bachau;F. Martín
中科院分区：
文献类型：
--
作者：
A. Palacios;H. Bachau;F. Martín
本文报道用超短真空紫外激光脉冲对氢分子的激发和电离的计算。该理论方法是基于含时薛定谔方程的解决方案，在一个固定的分子状态的基础上，包括所有的电子和振动自由度。我们表明，使用飞秒真空紫外脉冲，即，脉冲的持续时间与分子振动周期的持续时间相当，可以用于通过将核运动约束到期望的时间间隔来有效地操纵分子响应。因此，它是可能的，以控制的比例解离到非解离电离和finalvibrating分布，并通过增加激光强度，以诱导阶梯拉比振荡，可以填充激发电子态不能直接光子吸收访问。所有这些效应的精确理论描述只能通过包括时间演化过程中的振动运动来实现。
We report calculations for excitation and ionization of the hydrogen molecule by using ultrashort vuv laser pulses. The theoretical method is based on the solution of the time-dependent Schrödinger equation in a basis of stationary molecular states that includes all electronic and vibrational degrees of freedom. We show that the use of femtosecond vuv pulses, i.e., of pulses with a duration comparable to that of the molecular vibrational period, can be used to efficiently manipulate the molecular response by constraining the nuclear motion to a desired time interval. Thus it is possible to control the ratio of dissociative to nondissociative ionization and the finalvibrational distribution and, by increasing the laser intensity, to induce stepladder Rabi oscillations that can populate excited electronic states not accessible by direct photon absorption. A precise theoretical description of all these effects can only be achieved by including the vibrational motion during the time evolution.