Spectroscopic analysis of jet-cooled AlCu

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Abstract
Diatomic AlCu has been interrogated using resonant two‐photon ionization spectroscopy in a supersonic expansion of helium. The ground state is shown to be X 1Σ+, deriving from the 3sAl23dCu10σ2 configuration, in agreement with theoretical predictions. The closed‐shell nature of this molecule results in a low density of electronic states, allowing the chemical bonding and electronic structure to be investigated in detail. Five excited electronic states have been observed and characterized, leading to a potential energy diagram based solely on experimental results. Constants experimentally determined for AlCu include a ground state bond length (r0) of 2.3389±0.0004 Å, a dissociation energy, D0○, of 2.315±0.012 eV, and an ionization potential of 7.065±0.014 eV.