Okabayashi Toshiaki, Kawajiri Hideaki, Umeyama Michiaki, Ide Chihiro, Oe Sumio, Tanimoto Mitsutoshi
Graduate School of Science and Technology, Shizuoka University, 836 Oya, Suruga-ku, Shizuoka 422-8529, Japan.
J Chem Phys. 2008 Sep 28;129(12):124301. doi: 10.1063/1.2977732.
The microwave spectrum of the PBr radical in the X (3)Sigma(-) ground electronic state has been observed by a source modulated spectrometer. The PBr radical was generated in a free space cell by an acdc glow discharge in a mixture of PBr(3) with He andor H(2). A spectrum with three spin components for each of the two isotopomers, P(79)Br and P(81)Br, was observed. The spectrum showed hyperfine splitting caused by interactions due to both bromine and phosphorus nuclei. The molecular constants including the magnetic hyperfine and nuclear quadrupole hyperfine interaction constants were determined by analyzing the observed spectrum. The spin density of the unpaired electrons was estimated from the observed hyperfine coupling constants to be 85.4% and 16.3% on the phosphorus and bromine atoms, respectively.
通过源调制光谱仪观测到了处于X (3)Σ(-)基电子态的PBr自由基的微波光谱。PBr自由基是在一个自由空间池中，通过PBr₃与He和/或H₂的混合气体中的交流直流辉光放电产生的。观测到了两种同位素异构体P(⁷⁹)Br和P(⁸¹)Br各自具有三个自旋分量的光谱。该光谱显示出由溴核和磷核相互作用引起的超精细分裂。通过分析观测到的光谱确定了包括磁超精细和核四极超精细相互作用常数在内的分子常数。根据观测到的超精细耦合常数估计，未成对电子在磷原子和溴原子上的自旋密度分别为85.4%和16.3%。
