Abstract
Bands in the CH 2 b ˜ 1 B 1 – a ˜ 1 A 1 transition between 12 500 and 13 000 cm −1 were recorded at Doppler-limited resolution using a transient frequency-modulation (FM) laser absorption spectrometer. Rotational levels in seven upper vibronic states: a ˜ ( 0 , 11 , 0 ) 1 , 3 , a ˜ ( 2 , 6 , 0 ) 1 , b ˜ ( 0 , 2 , 0 ) 4 , b ˜ ( 1 , 1 , 0 ) 1 , 2 , and b ˜ ( 0 , 3 , 0 ) 1 were assigned with the assistance of optical–optical double resonance (OODR) and ground state combination differences. Perturbations due to rotation-vibration coupling, anharmonic couplings, ℓ-resonance, as well as the Renner–Teller effect are discussed as sources of the irregular rotational patterns observed in the b ˜ ( 0 , 3 , 0 ) 1 , b ˜ ( 1 , 1 , 0 ) 1 , and a ˜ ( 0 , 11 , 0 ) 3 vibronic levels.
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