Perturbations of the A′1Π and C1Σ+ states of CaO
Perturbations of the A′1Π and C1Σ+ states of CaO
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DOI：
10.1016/j.jms.2020.111293
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发表时间：
2020-04-01
影响因子：
1.4
通讯作者：
Field, Robert W.
中科院分区：
文献类型：
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作者：
Bresler, Sean M.;Schmitz, Joel R.;Field, Robert W.
用喷冷CaO的激光诱导荧光光谱研究了A‘(1)Pi(X sigma pi(-1))态(v=10-17)和C-1 sigma(+)(B sigma(-1))态的v=6-8振动能级。由b(3)Sigma(+)(Omega=1)(X Sigma(-1))v=14能级的自旋轨道相互作用引起的A‘态的v=17微扰是明显的。通过对标称未微扰能级的数据进行拟合，得到了A‘态的旋转振动常数。A‘(1)Pi(X sigma pi(-1))态v=10-17能级的平均辐射寿命为2.6u S，与V没有可测量的依赖关系，这与A’(1)Pi-X-1Sigma(+)能带系统有一个相对较小的跃迁偶极矩的理论预测相一致。DLIF谱清楚地表明，微扰Omega=0(+)态是三重态的一个分量。观察到从这个态到a(3)pI(0(+))(X sigma pi(-1))态的强烈跃迁。构型参数支持将微扰态指定为以前未观察到的g(3)Pi(0(+))(B sigma pi(-1))态的v=12振动能级。(C)2020 Elsevier Inc.保留所有权利。
Laser induced fluorescence spectra for jet-cooled CaO have been used to examine the higher vibrational levels of the A'(1)Pi(X sigma pi(-1)) state (v = 10-17) and the v = 6-8 vibrational levels of the C-1 Sigma(+)(B sigma sigma(-1)) state. A perturbation of v = 17 of the A' state was evident, caused by a spin-orbit mediated interaction with the b(3)Sigma(+)(Omega = 1)(X sigma sigma(-1)) v = 14 level. Ro-vibrational constants for the A' state were obtained by fitting to the data for nominally unperturbed levels. The average radiative lifetime for the A'(1)Pi(X sigma pi(-1)) state v = 10-17 levels was 2.6 mu s, with no measurable dependence on v. This was consistent with the theoretical prediction of a relatively small transition dipole moment for the A'(1)Pi-X-1 Sigma(+) band system.A homogeneous perturbation of the C-1 Sigma(+)(B sigma sigma(-1)) v = 7 level was examined by means of dispersed laser induced fluorescence (DLIF) and radiative lifetime measurements. The DLIF spectra clearly demonstrate that the perturbing Omega = 0(+) state is a component of a triplet state. Intense transitions from this state to the a(3)Pi(0(+))(X sigma pi(-1)) state were observed. Configurational arguments are presented that support assignment of the perturbing state as the v = 12 vibrational level of the previously unobserved g(3)Pi(0(+))(B sigma pi(-1)) state. (C) 2020 Elsevier Inc. All rights reserved.