Abstract
Jet-cooled LiCu has been investigated using resonant two-photon ionization spectroscopy. A long vibrational progression was observed and identified as the [20.5] Σ+1←XΣ+1 band system. Ten bands of the system were rotationally resolved for Li637Cu, giving bond lengths of r0=2.2618(3) Å for the X1Σ+ state and re′=2.74(4) Å for the [20.5] Σ+1 state. The fitted spectroscopic parameters of the [20.5] Σ+1 state were used to obtain a RKR estimate of the [20.5] Σ+1 potential energy curve. The unusual shape of this curve is thought to derive from avoided crossings between the Li+Cu− ion pair state and covalent states, with the Li+Cu− ion pair state ultimately correlating to the ground electronic state of the molecule.
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