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论文类型：期刊论文

发表时间：2012-04-01

发表刊物：EUROPEAN PHYSICAL JOURNAL D

收录刊物：SCIE、Scopus

卷号：66

期号：4

ISSN号：1434-6060

摘要：We demonstrate theoretically that an efficient field-free molecular orientation driven by the positively chirped laser pulse whose frequency is in the terahertz regime can be achieved, taking the LiH molecule for example. Exact numerical calculations are performed by solving the time-dependent Schrodinger equation including the vibrational and rotational degrees of freedom. The maximal orientation degree of the LiH molecule vertical bar < cos theta >vertical bar(max) = 0.85 under the action of chirped laser pulse with the peak intensity of 4.78 x 10(8) W/cm(2) at T = 0 K, which is larger than vertical bar < cos theta >vertical bar(max)=0.75 driven by the half-cycle laser pulse with the same intensity. The molecular orientation degree decreases with the increase of temperature.