Abstract The laser-induced fluorescence (LIF) excitation spectra and single vibronic level (SVL) emission spectra of tungsten monosulfide (WS) molecule have been recorded in the range of 13,100–16,500 cm−1 using laser ablation/reaction free-jet expansion. 13 vibronic bands are observed and grouped into 3 electronic band systems including the [15.30]1–X0+, [15.10]1–X0+, and [a + 13.12]1–X1 transitions. The first two transition progressions are experimentally observed for the first time. When the previously observed electronic transition system [a + 12.92]1–X1 (Tsang et al., 2019) is also included, the four observed systems are assigned as the two spin-orbit components X0+ and X1 of the 3Σ− ground state to the two upper states [15.30]1 and [15.10]1. The spin-orbit splitting between the X0+ and X1 states is determined as 2λ = 2181.10(9) cm−1. The spin-orbit splitting in the ground electronic state and the primarily attributed Λ-S states in the excited states are discussed.

中文翻译：

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一硫化钨基态下的自旋轨道分裂

摘要 使用激光烧蚀/反应自由射流膨胀在 13,100–16,500 cm-1 范围内记录了单硫化钨 (WS) 分子的激光诱导荧光 (LIF) 激发光谱和单振动能级 (SVL) 发射光谱。观察到 13 个振动带并将其分为 3 个电子带系统，包括 [15.30]1-X0+、[15.10]1-X0+ 和 [a + 13.12]1-X1 跃迁。前两个过渡进程是第一次通过实验观察到。当先前观察到的电子跃迁系统 [a + 12.92]1–X1 (Tsang et al., 2019) 也包括在内时，四个观察到的系统被指定为 3Σ− 基态的两个自旋轨道分量 X0+ 和 X1 为上面的两个状态 [15.30]1 和 [15.10]1。X0+ 和 X1 状态之间的自旋轨道分裂被确定为 2λ = 2181.10(9) cm-1。