Abstract
To explore the possibility of K-level resolved, 2+1 resonance-enhanced multiphoton ionization (REMPI) processes of the methyl radical, the two-photon absorption selection rules and rotational line strengths of the 3 0 1 and 4 0 1 vibronic bands of the transition |np 2A″ 2〉←| X ̃ 2A″ 2〉 ( n=3 or 4) were reported. Stringent selection rules, which were imposed upon these two-photon transitions, are the initial K″=3 p ( p=0,1,2,…), Δ K=±2, Δ U=±3, and Δ N=0,±1,±2 ( O, P, Q, R, and S branches). The previously assigned 2 2 2 vibronic band of the methyl radical should be studied by the REMPI with a better spectral resolution and analyzed by the newly derived two-photon absorption selection rules and rotational line strength formulas.
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