Resonant two‐photon ionization spectroscopy has been applied to jet‐cooled diatomic CuAu. Eight band systems have been observed, rotationally resolved, and analyzed. The ground state is X 1Σ+ in symmetry, deriving from the 3d10Cu5d10Auσ2 molecular configuration. Its bond length has been determined as r0=2.3302±0.0006 A (1σ error limits). The first excited state is the a 3Σ+ state, which derives from the 3d10Cu5d10Auσ1σ*1 molecular configuration. This state possesses a nominal bond order of zero, but is nevertheless bound by D0=1157±150 cm−1 and has a bond length of 2.428±0.028 A. It is observed through the a 3Σ+–X 1Σ+ transition which is very weak, with f≊5×10−5. Seven higher energy band systems are also observed, most of which correlate asymptotically to d‐hole states described by the Cu 3d104s1, 2S+Au 5d96s2, 2D5/2, Cu 3d94s2, 2D5/2+Au 5d106s1, 2S, and Cu 3d94s2, 2D3/2+Au 5d106s2, 2S separated atom limits. The D 0+ excited state, however, displays a very large oscillator strength in transitions with the...
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