Theoretical study of impulsive orientation of asymmetric top water molecules

We theoretically study the orientation of a polar, asymmetric top molecule by a terahertz half-cycle pulse. This study is motivated by recent experimental results by C. Herne and P.H. Bucksbaum on the orientation of water molecule using terahertz half-cycle pulses. The half-cycle pulse is modelled as an impulse. The degree of orientation is calculated. Our aim is to characterize the calculated orientation curves in terms of rotational spectroscopy constants.