title: Controlling rotational dynamics and alignment of molecule by infrared laser pulse.
abstract: We investigate the effects of delayed infrared laser (IRL) pulse shape on the non-adiabatic rotational excitation and alignment of a polar molecule. We suggest a control scheme for choosing populations of molecular rotational states by wave packet interference. The rotational wave packets of polar molecule (here HBr) excited non-adiabatically by orienting pulse is controlled actually using the second delayed IRL pulse. By adjusting the time delay between the two laser pulses and the shape of delayed IRL pulse, constructive or destructive interference among these wave packets enables the population to be enhanced or repressed for the specific rotational state. We have used fourth order Runge-Kutta method to study the non-adiabatic rotational excitation (NAREX) dynamics.
authors.affiliation: Department of Physics and Astrophysics, University of Delhi, Delhi 110 007, India. uarya@physics.du.ac.in
authors.forename: Urvashi
authors.initials: U
authors.lastname: Arya
authors.forename: Ashish
authors.initials: A
authors.lastname: Tyagi
authors.forename: Vinod
authors.initials: V
authors.lastname: Prasad
mesh_terms: D000465:Algorithms; D018054:Hydrobromic Acid / Q000737:chemistry*; D007259:Infrared Rays; D007834:Lasers; D011789:Quantum Theory
chemical_list: D018054:Hydrobromic Acid