Far-infrared laser magnetic resonance spectroscopic study of the nu(2) bending fundamental of the CCN radical in its (X)over-tilde(2)Pi(r) 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 resonan ces. The LMR data, combined with previous data, were used to determine vibr ational, Renner-Teller, fine-structure, rotational, hyperfine, and molecula r g-factor parameters using a least-squares fitting routine. The model used was an NZ effective Hamiltonian modified to include the Renner-Teller effe ct 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 t o 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 determ ined for the first time.