Abstract
The MgCl + cation has been observed with spectroscopic methods for the first time. The fast ion beam laser technique was used to record an absorption spectrum due to MgCl + in the wavelength range 580–620 nm. No banded structure could be observed, indicating that the upper state is purely repulsive or weakly bound. The observed spectrum is ascribed to the A 1Π-X 1Σ + transition. Calculations of Franck-Condon densities and differential oscillator strengths based on recent ab initio calculated potential curves of MgCl + by Åkeby and Pettersson are consistent with this interpretation.
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