Results from new laser excitation spectra of 20Ne2 have been combined with previously published experimental and theoretical data to provide a consistent picture describing many of the Rydberg states observed below the first ionization limit. These states are found to fall mainly into Rydberg series converging on the ...3σu X 2Σ+u ground core of Ne+2. Spectral data for the npσ 3Σ+g←a 3Σ+u and npπ 3Πg←a 3Σ+u series support the current assignments of the upper states. Although (0–0) bands dominate these series, other vibronic transitions are observed. The 6–23pσ 3Σ+g–a(0–0) bands are more perturbed than the npπ 3Πg–a(0–0) series; hence, data for 4–17pπ 3Π+g–a(0–0) and 4–6fλ(3Σ+g,3Π+g)–a(0–0) were used to determine a value of 34 409±2 cm−1 for the lowest ionization limit of 20Ne2. Rotational constants for the v=0 levels of 4–17pπ 3Πg and 10–23pσ 3Σ+g also are presented.
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