Abstract
Spectra of jet-cooled AlAr and AlKr have been collected over the range from 31 000 cm−1 to the ionization limit, using the technique of resonant two-photon ionization spectroscopy with mass spectrometric detection. Adiabatic ionization potentials have been accurately measured for both molecules, and have been estimated for AlAr2 and AlAr3. The spin–orbit splittings in the X 2Π ground state have been determined for both AlAr and AlKr, and ground-state bond strengths have been accurately measured as D0[AlAr, X1 2Π1/2(3p)] =122.4±4 cm−1 and D0[27Al 84Kr, X1 2Π1/2(3p)] =194.7±0.8 cm−1. These values have also been combined with the measured ionization potentials to derive D0(Al+–Ar)=982.3± 5 cm−1 and D0(Al+–Kr)=1528.5±2 cm−1.
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