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Laser spectroscopic investigation of the X 2Σ1/2 state of the van der Waals molecule NaAr
Authors:G Aepfelbach  A Nunnemann  D Zimmermann
Institution:Institut für Strahlungs Kemphysik, Technische Universität Berlin, Rondellstrasse 5, D-1000 Berlin 37, Germany
Abstract:The laser-excitation spectrum of the transition X 2Σ+ → A 2Π of NaAr has been investigated using a supersonic expansion of a mixture of sodium vapor and argon gas for production of the molecules. In comparison to preyous investigations the rotational constants of the vibrational levels ν″ = 2, 3 and 4 of the X 2Σ+ state could in addition be determined. From our results we deduce a value of Re = 5.008(5) × 10?10 m for the equilibrium internuclear distance and of De = 41.7(δ) cm?1 for the well depth of the X 2Σ+ state.
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