title: Laser-induced enhancement of tunneling in NHD2.
abstract: We apply and explore techniques aiming at enhancing the tunneling by laser fields, originally developed for a one-dimensional model, to a complete six-dimensional vibrational model of the inversion motion in NHD(2). The computational study is performed with the multi-configuration time-dependent Hartree method. Assuming an ideal three-dimensional alignment we obtain a driven tunneling time twenty times smaller than the natural one, in rather good agreement with an oversimplified three-state model. In the case of one-dimensional alignment, a linearly polarized field leads to a poor enhancement of the tunneling probability, after averaging over the rotation about the alignment axis, whereas a circularly polarized field improves the rotationally averaged tunneling probability at the end of the pulse.
authors.affiliation: Laboratoire Interdisciplinaire Carnot de Bourgogne UMR 5209 CNRS, Université de Bourgogne, BP 47870, F-21078 Dijon, France.
authors.forename: Matthieu
authors.initials: M
authors.lastname: Sala
authors.forename: Stéphane
authors.initials: S
authors.lastname: Guérin
authors.forename: Fabien
authors.initials: F
authors.lastname: Gatti
authors.forename: Roberto
authors.initials: R
authors.lastname: Marquardt
authors.forename: Hans-Dieter
authors.initials: HD
authors.lastname: Meyer