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Title: Helium-induced electronic transitions in photo-excited Ba+-He-n exciplexes
Author: Zandbergen, Patricia Vindel
Barranco Gómez, Manuel
Cargnoni, Fausto
Drabbels, Marcel
Pi Pericay, Martí
Halberstadt, Nadine
Keywords: Heli
Química quàntica
Funcions d'ona
Quantum chemistry
Wave functions
Issue Date: 14-Apr-2018
Publisher: American Institute of Physics
Abstract: The possibility for helium-induced electronic transitions in a photo-excited atom is investigated using Ba+ excited to the 6p P-2 state as a prototypical example. A diabatization scheme has been designed to obtain the necessary potential energy surfaces and couplings for complexes of Ba+ with an arbitrary number of helium atoms. It involves computing new He-Ba+ electronic wave functions and expanding them in determinants of the non-interacting complex. The 6p P-2 <- 6s S-2 photodissociation spectrum of He center dot center dot center dot Ba+ calculated with this model shows very weak coupling for a single He atom. However, several electronic relaxation mechanisms are identified, which could potentially explain the expulsion of barium ions from helium nanodroplets observed experimentally upon Ba+ photoexcitation. For instance, an avoided crossing in the ring-shaped He7Ba+ structure is shown to provide an efficient pathway for fine structure relaxation. Symmetry breaking by either helium density fluctuations or vibrations can also induce efficient relaxation in these systems, e.g., bending vibrations in the linear He2Ba+ excimer. The identified relaxation mechanisms can provide insight into helium-induced non-adiabatic transitions observed in other systems. Published by AIP Publishing.
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It is part of: Journal of Chemical Physics, 2018, vol. 148, num. 14
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ISSN: 0021-9606
Appears in Collections:Articles publicats en revistes (Física Quàntica i Astrofísica)

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