Hyperfine Structure of the C5H, C6H, and C8H Radicals
Hyperfine Structure of the C5H, C6H, and C8H Radicals
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C5H、C6H 和 C8H 自由基的超精细结构
DOI：
10.1086/307434
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发表时间：
1999
期刊：
影响因子：
--
通讯作者：
P. Thaddeus
中科院分区：
文献类型：
--
作者：
M. McCarthy;W. Chen;A. Apponi;C. Gottlieb;P. Thaddeus
用傅里叶变换微波光谱仪测量了C5H、C6H和C8H碳链自由基旋转跃迁过程中的超精细结构。每个自由基在7 ~ 22 GHz之间测量了足够多的跃迁（4 ~ 6个），从而高精度地确定了氢超精细耦合常数。在低于50千兆赫的频率下，每个原子团的无线电频谱在等效径向速度下可以计算出优于0.30 km s-1，这足以用于像TMC-1这样的非常窄的线源的射电天文学研究。
Hyperfine structure in the rotational transitions of the C5H, C6H, and C8H carbon chain radicals has been measured with a Fourier transform microwave spectrometer. Enough transitions (four to six) between 7 and 22 GHz were measured for each radical to determine the hydrogen hyperfine coupling constants to high precision. The radio spectrum of each radical can now be calculated to better than 0.30 km s-1 in equivalent radial velocity at frequencies less than 50 GHz, adequate for radio astronomical studies in very narrow line sources like TMC-1.