Bulletin of the American Physical Society
54th Annual Meeting of the APS Division of Atomic, Molecular and Optical Physics
Volume 68, Number 7
Monday–Friday, June 5–9, 2023; Spokane, Washington
Session S11: V: Ultrafast Phenomena
10:30 AM–12:30 PM,
Thursday, June 8, 2023
Room: Virtual Platform
Chair: Carlos Marante Valdes, University of Central Florida
Abstract: S11.00010 : Diatomic molecular vibrations in a strong infrared laser field: an analytic treatment of the laser-dressed Morse potential*
12:18 PM–12:30 PM
Presenter:
Szabolcs Hack
(ELI-HU Non-Profit Ltd.)
Authors:
Szabolcs Hack
(ELI-HU Non-Profit Ltd.)
Attila Czirják
(ELI-ALPS and University of Szeged)
Gábor Paragi
(University of Szeged, University of Pécs and MTA-SZTE Biomimetic Systems Research Group)
Péter Földi
(University of Szeged, ELI-ALPS)
Imre F Barna
(Wigner RCP)
Sándor Varró
(Wigner RCP and ELI-ALPS)
In this contribution we present a general mathematical method to treat a Morse potential in the presence of a strong IR excitation. The interaction term of the Hamiltonian includes the permanent and laser-induced dipole moment of the diatomic (verified by DFT calculation), therefore, our model can be applied to both homo- and heteronuclear diatomics. As a possible use we apply our procedure to H2 and LiH and we show how an IR laser field in the intensity range of 1012-1013 W/cm2 noticeably shifts the vibrational levels and the equilibrium internuclear distance of the molecules. According to our results, the dipole gradient and the polarizability gradient are the essential molecular parameters in these effects. We give the exact analytic energy eigenvalues of the molecular vibration utilizing the Kramers-Henneberger frame [3].
[1] A. Palacios, J. L. Sanz-Vicario, and F. Martín, Theoretical methods for attosecond electron and nuclear dynamics: applications to the H2 molecule, Journal of Physics B: Atomic, Molecular and Optical Physics 48, 242001 (2015).
[2] B. Molnár B, P. Földi, M. G. Benedict and F. Bartha, Time evolution in the Morse potential using supersymmetry: Dissociation of the NO molecule Europhysics Letters 61, 445–451 (2003)
[3] S. Varró, Sz. Hack, G. Paragi, P. Földi, F. Barna and A. Czirják, Diatomic molecule in a strong infrared laser field: level-shift and bond-length change due to laser-dressed Morse potential (in preparation)
*The ELI ALPS project (GINOP-2.3.6-15-2015-00001) is supported by the European Union and co-financed by the European Regional Development Fund.
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