The A←X transition in Cr2: Predissociation, isotope effects, and the 1–1 sequence band

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Abstract
Two‐color resonance‐enhanced ionization spectroscopy with mass analysis is performed on beams of Cr2 produced by laser vaporization and isentropic expansion cooling. For the A←X 0–0 band near 459.6 nm an extensive rotational spectrum is observed and its intensity profile is found to have a systematic modulation with J. This modulation, and its surprisingly strong dependence on isotopic composition, are interpreted in terms of a two‐step predissociation of the A state and suggest a potentially important new procedure for isotope enrichment in metal systems. An additional resonant feature is found ∼1 nm to the red of the origin band and is assigned to the 1–1 sequence band.