Repository: Freie Universit├Ąt Berlin, Math Department

Quantum dynamics of a polar rotor acted upon by an electric rectangular pulse of variable duration

Karra, M. and Friedrich, B. and Schmidt, B. (2021) Quantum dynamics of a polar rotor acted upon by an electric rectangular pulse of variable duration. Molecular Physics, 119 . e1966111. ISSN 0026-8976

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Abstract

As demonstrated in our previous work [J. Chem. Phys. 149, 174109 (2018)], the kinetic energy imparted to a quantum rotor by a non-resonant electromagnetic pulse with a Gaussian temporal profile exhibits quasi-periodic drops as a function of the pulse duration. Herein, we show that this behavior can be reproduced with a simple waveform, namely a rectangular electric pulse of variable duration, and examine, both numerically and analytically, its causes. Our analysis reveals that the drops result from the oscillating populations that make up the wavepacket created by the pulse and that they are necessarily accompanied by drops in the orientation and by a restoration of the pre-pulse alignment of the rotor. Handy analytic formulae are derived that allow to predict the pulse durations leading to diminished kinetic energy transfer and orientation. Experimental scenarios are discussed where the phenomenon could be utilized or be detrimental.

Item Type:Article
Subjects:Physical Sciences > Chemistry > Physical Chemistry
Physical Sciences > Physics > Chemical Physics
Physical Sciences > Physics > Mathematical & Theoretical Physics
Physical Sciences > Physics > Mathematical & Theoretical Physics > Computational Physics
Divisions:Department of Mathematics and Computer Science > Institute of Mathematics > Geophysical Fluid Dynamics Group
ID Code:2569
Deposited By: BioComp Admin
Deposited On:04 May 2021 08:00
Last Modified:01 Oct 2021 11:59

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