Department of Chemistry, University of Alberta, Edmonton, Alberta T6G2G2, Canada.
Faraday Discuss. 2009;142:297-309; discussion 319-34. doi: 10.1039/b819844f.
The pure rotation spectrum of carbonyl sulfide embedded in superfluid helium nanodroplets was measured in the frequency range from 4 to 15.5 GHz. Four lines, corresponding to the J = 1-0, J = 2-1, J = 3-2, and J = 4-3 transitions, were found. The line widths of the transitions increase with increasing rotational quantum number J, which is indicative of a distribution of the effective B rotational constant. A comparison of the pure rotational spectrum with the microwave-infrared double resonance spectrum [S. Grebenev, M. Havenith, F. Madeja, J. P. Toennies, and A. F. Vilesov, J. Chem. Phys., 2000, 113(20), 9060] reveals that the double resonance measurement scheme probes predominantly rotational transitions within the vibrationally excited state.
羰基硫在超流氦纳米液滴中的纯旋转光谱在 4 至 15.5 GHz 的频率范围内进行了测量。发现了对应于 J = 1-0、J = 2-1、J = 3-2 和 J = 4-3 跃迁的四条谱线。跃迁的线宽随转动量子数 J 的增加而增加，这表明有效 B 转动常数存在分布。与微波-红外双共振光谱的比较[S. Grebenev、M. Havenith、F. Madeja、J. P. Toennies 和 A. F. Vilesov，J. Chem. Phys.，2000，113（20），9060]表明，双共振测量方案主要探测振动激发态中的转动跃迁。
