Allen MD, Evenson KM, Gillett DA, Brown JM
National Institute of Standards and Technology, Time and Frequency Division 847, 325 Broadway, Boulder, Colorado, 80303
J Mol Spectrosc. 2000 May;201(1):18-29. doi: 10.1006/jmsp.2000.8075.
Bending vibration-rotation transitions between the (010) µ(2)Sigma(-) and (000) (2)Pi(r) vibronic states of the CCN radical in its ground electronic state 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 N(2) effective Hamiltonian modified to include the Renner-Teller effect explicitly in a (2)Pi electronic state. The band origin for the (010) µ(2)Sigma(-) <-- (000) &Xtilde;(2)Pi(r) 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 (14)N-hyperfine parameters determined for the first time.
利用远红外激光磁共振（FIR LMR）光谱法，观测到处于基电子态的CCN自由基在（010）μ（2）Σ⁻和（000）（2）Πᵣ振转态之间的弯曲振动-转动跃迁。使用13条FIR激光线记录了769个共振峰。通过最小二乘法拟合程序，将LMR数据与先前数据相结合，用于确定振动、伦纳-泰勒、精细结构、转动、超精细和分子g因子参数。所使用的模型是一个N（2）有效哈密顿量，经过修改以在（2）Π电子态中明确包含伦纳-泰勒效应。（010）μ（2）Σ⁻←（000）&Xtilde;（2）Πᵣ跃迁的带源确定为179.598176±0.000067 cm⁻¹。对基态的自旋-轨道分裂进行了细化，并首次确定了完整的（14）N超精细参数集。
