Abstract
The laser fluorescence excitation spectrum of the Al +–Ar complex near the Al + ion 3s3p 1 P ← 3s 2 1 S resonance transition is reported. An excited-state ( v′, 0) progression and the (0, 1) hot band were observed. Rotational analysis revealed that these bands involve an electronic transition from the Al +–Ar X 1 Σ + ground state to the 1 Σ + state correlating with the Al +( 1 P )+Ar asymptote. Rotational constants and upper-state vibrational constants and the dissociation energy were determined. The spectroscopic constants of the two observed Al +–Ar electronic states are compared with those for neutral AlAr states.
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