Excitation spectra of the d3Πg – c3Σu– band system of C2
Excitation spectra of the d3Πg – c3Σu– band system of C2
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C2 d3Πg – c3Σu– 能带系统的激发光谱
DOI：
10.1016/j.jms.2014.06.002
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发表时间：
2014
期刊：
影响因子：
--
通讯作者：
Y.
中科院分区：
文献类型：
--
作者：
Nakajima;M.;Endo;Y.
用激光诱导荧光光谱法在室温下观测了C2分子d3 g-c3 u+带系的激发光谱。在v= 0，1，2，3和5水平上测定了c 3 u+态的分子常数，包括离心畸变常数。通过同时观测d3 g-c3 u+系统的3-1带和Swan系统的3-7带，明确地确定了c3 u+态的v= 1能级和a3 u+态的v= 7能级之间的能级交叉。在这些振动能级中观察到的转动能级位移可以用自旋轨道和转动哈密顿量的L±S和J±L项引起的微扰来解释。给出了c3 <$u+（v= 1）和a3 <$u（v= 7）态的去微扰分子常数，并讨论了另一能级A1 <$u（v= 2）的额外微扰的可能性.
Excitation spectra of the d 3 Π g-c 3 Σ u+ band system of the C 2 molecule were observed at room temperature by laser-induced fluorescence spectroscopy. Molecular constants of the c 3 Σ u+ state were determined for the v= 0, 1, 2, 3, and 5 levels, including the centrifugal distortion constant. A level crossing between the v= 1 level of the c 3 Σ u+ state and the v= 7 level of the a 3 Π u state was unambiguously identified by simultaneously observing the 3–1 band of the d 3 Π g-c 3 Σ u+ system and the 3–7 band of the Swan system. Rotational level shifts observed in these vibronic levels could be explained by the perturbations arising from the L±S∓ and J±L∓ terms of the spin-orbit and rotational Hamiltonians. De-perturbed molecular constants for the c 3 Σ u+(v= 1) and a 3 Π u (v= 7) states are presented, and the possibility of an additional perturbation by another level, A 1 Π u (v= 2), is discussed.