A theoretical scheme is presented to realize effective molecular orientation driven by two super-Gaussian pulses (SGPs). As an applied example, the orientation dynamics of LiH molecule is studied by using the time-dependent quantum wave packet method. The calculations are performed including both the molecular vibrational and rotational degrees of freedom. It is shown that the efficient molecular orientation can be achieved by two SGPs, and the maximal orientation degree is 0.823, which is obviously better than those by the Gaussian pulse and a single SGP. The orientation degree and orientation duration time are dependent on the laser frequency, field intensity and delay time between two SGPs. The pulse shaped parameter N characterizing the SGP has effects on molecular orientation and rotational population. Furthermore, the molecular orientation degree and orientation duration time decrease with the increase of temperature. A long-lived molecular orientation duration time...

中文翻译：

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利用两个超高斯脉冲增强分子取向

提出了一种理论方案来实现由两个超高斯脉冲（SGP）驱动的有效分子取向。作为一个应用实例，利用时变量子波包方法研究了LiH分子的取向动力学。进行的计算包括分子振动和旋转自由度。结果表明，两个SGP可以实现有效的分子取向，最大取向度为0.823，明显优于高斯脉冲和单个SGP。定向度和定向持续时间取决于两个SGP之间的激光频率，场强和延迟时间。表征SGP的脉冲状参数N对分子取向和旋转种群有影响。此外，分子取向度和取向持续时间随温度的升高而降低。分子定向寿命持续时间长...