We present a general variational approach for computing the laser-induced rovibrational dynamics of molecules, taking into account the hyperfine effects of the nuclear quadrupole coupling. The method combines the general variational approach TROVE (Theoretical Ro-Vibrational Energies), which provides accurate rovibrational hyperfine energies and wavefunctions for arbitrary molecules, with the variational method RichMol, designed for generalized simulations of the rovibrational dynamics in the presence of external electric fields. We investigate the effect of the nuclear quadrupole coupling on the short-pulse laser alignment of a prototypical molecule CFClBrI, which contains nuclei with large quadrupole constants. The influence of the nuclear quadrupole interactions on the postpulse molecular dynamics is negligible at early times, for the first several revivals; however, at longer time scales, the effect is entirely detrimental and strongly depends on the laser intensity. This effect can be explained by dephasing in the laser-excited rotational wavepacket due to irregular spacings between the hyperfine-split nuclear spin states across different rotational hyperfine bands.
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28 December 2019
Research Article|
December 27 2019
Laser-induced dynamics of molecules with strong nuclear quadrupole coupling
Andrey Yachmenev
;
Andrey Yachmenev
a)
1
Center for Free-Electron Laser Science, Deutsches Elektronen-Synchrotron DESY
, Notkestraße 85, 22607 Hamburg, Germany
2
Center for Ultrafast Imaging, Universität Hamburg
, Luruper Chaussee 149, 22761 Hamburg, Germany
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Linda V. Thesing;
Linda V. Thesing
1
Center for Free-Electron Laser Science, Deutsches Elektronen-Synchrotron DESY
, Notkestraße 85, 22607 Hamburg, Germany
2
Center for Ultrafast Imaging, Universität Hamburg
, Luruper Chaussee 149, 22761 Hamburg, Germany
3
Department of Physics, Universität Hamburg
, Luruper Chaussee 149, 22761 Hamburg, Germany
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Jochen Küpper
Jochen Küpper
1
Center for Free-Electron Laser Science, Deutsches Elektronen-Synchrotron DESY
, Notkestraße 85, 22607 Hamburg, Germany
2
Center for Ultrafast Imaging, Universität Hamburg
, Luruper Chaussee 149, 22761 Hamburg, Germany
3
Department of Physics, Universität Hamburg
, Luruper Chaussee 149, 22761 Hamburg, Germany
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a)
Electronic mail: [email protected]. URL: https://www.controlled-molecule-imaging.org.
J. Chem. Phys. 151, 244118 (2019)
Article history
Received:
October 27 2019
Accepted:
December 03 2019
Citation
Andrey Yachmenev, Linda V. Thesing, Jochen Küpper; Laser-induced dynamics of molecules with strong nuclear quadrupole coupling. J. Chem. Phys. 28 December 2019; 151 (24): 244118. https://doi.org/10.1063/1.5133837
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