Abstract
We demonstrate theoretically that the long-lived and efficient field-free molecular orientation can be realized by utilizing two few-cycle terahertz pulses (FCTPs) appropriately delayed in time at a finite temperature. The calculations are performed by solving the time-dependent Schrödinger equation including the vibrational and rotational degrees of freedom, with LiH as example. By adjusting these parameters of TFCP, a high efficient and long-lived molecular orientation can be obtained.
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