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Photoassociation of metastable helium

Lookup NU author(s): Professor Alan Dickinson

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Abstract

A theoretical study is performed for the photoassociation of metastable helium. Combining short-range, high-level, ab initio calculations for 5sumg/u+ and 5∏g/u symmetries and long-range behaviour, better described in Hund's case (c), potential-energy curves for attractive, 5∑u+ and 5∏g, as well as repulsive, 5∏u and 5∑g+, states of quintet metastable helium molecules dissociating to 23S + 23P are obtained. Taking into account the atomic spin-orbit couplings, vibrational levels are derived for near-dissociation levels at the 3P2 asymptote. Comparison with results from three recent photoassociation experiments obtained under different conditions (μK temperatures with spin alignment and mK temperatures without) allowed for an assignation of about three quarters of the observed levels, The robustness of the vibrational numbering is confirmed by testing a modification of the short-range potentials. © EDP Sciences.

Publication metadata

Author(s): Dickinson AS, Gadea FX, Leininger T

Publication type: Article

Publication status: Published

Journal: Europhysics Letters

Year: 2005

Volume: 70

Issue: 3

Pages: 320-326

ISSN (print): 0295-5075

ISSN (electronic): 1286-4854

Publisher: EDP Sciences

URL: http://dx.doi.org/10.1209/epl/i2004-10491-y

DOI: 10.1209/epl/i2004-10491-y

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