Far-infrared laser magnetic resonance spectroscopic study of the ν2 bending fundamental of the CCN radical in its (X)over-tilde2Πr state

Bending vibration-rotation transitions between the (010) mu(2)Sigma(-) and (000) (II)-I-2, vibronic states of the CCN radical in its ground electronic stare have been observed using far-infrared laser magnetic resonance (FIR LMR) spectroscopy. Thirteen FIR laser lines were used to record 769 resonances. The LMR data, combined with previous data, were used to determine vibrational, Renner-Teller, fine-structure, rotational, hyperfine, and molecular g-factor parameters using a least-squares fitting routine. The model used was an NZ effective Hamiltonian modified to include the Renner-Teller effect explicitly in a (II)-I-2 electronic state. The band origin for the (010) mu(2)Sigma(-) - <-- (000) (X) over tilde(2)II, transition was determined to be 179.598176 +/- 0.000067 cm(-1). The spin-orbit splitting in the ground state was refined and the complete set of N-14-hyperfine parameters determined for the first time.