Non-adiabatic rotational excitation of dipolar molecule under the influence of delayed pulses

Abstract

We suggest a control scheme for choosing populations of molecular rotational states by wave packet interference. The rotational wave packets of LiCl molecule excited non-adiabatically by half cycle pulse (HCP) is controlled using the second ultrashort HCP. By adjusting the time delay between the two laser pulses, constructive or destructive interference among these wave packets enables the population to be enhanced or repressed for the specific rotational state. The role played by the field strength and the pulse duration is also calculated numerically. We have used fourth order Runge-Kutta method to study non-adiabatic rotational excitation (NAREX) dynamics.Keywords. NAREX; delay time; wave packet interference.inserting the equations (8) and (9) into equation (7), one obtains a set of coupled equations for the timedependent expansion coefficients,The selection rules J = J ± 1 and M = M simplify the differential equation (10) asandThe time-dependent rotational wave packet (8) is thusThe matrix elements J M i | cos (θ) |J M i for J = J ±

Orientation and Alignment Dynamics of Polar Molecule Driven by Shaped Laser Pulses

“…The orientation dynamics of dipolar molecules in delayed pulses shows interesting behaviour. It is noticed in studies done in reference [89], (figure 7(b)), that when molecule is exposed to only HCP, Orientation increases with increase in pulse duration, however when HCP is applied in combination with delayed ultrshort HCP the dynamics gets reversed and maximum orientation is attained when initial HCP pulse is exposed for small duration.…”

“…Single pulse approach to stusdy nonadiabatic alignment is practiced by many []. However when we apply laser pulses in different combinations NAREX changes appreciably and gives reasonable field free orientation [81][82][83][84][85][86][87][88][89][90][91][92][93][94][95][96][97][98][99]133,218,332,335].…”