Resonant multiphoton ionization spectrum and electronic structure of CH radical. New states and assignments above 50 000 cm−1

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Abstract
Resonant multiphoton ionization spectra, with mass and photoelectron analysis, of photolytically produced CH radical yields previously unobserved bands arising from two‐photon transitions to Rydberg and highly excited valence states. Rotational analysis of the spectrum for m/e=13, coupled with vibrational labeling of the resonant state by photoelectron kinetic energy analysis, identifies a new state, designated E’ 2Σ+. Breaking off of rotational structure near N’=11 in the v=2 level of the D 2Πi state is attributed to predissociation by a doubly excited potential curve calculated to lie in this energy region. Comparison is made with earlier absorption spectra taken following flash photolysis.