Laser-induced fluorescence spectroscopy of jet-cooled WO in 18, 900–23, 500 cm−1
Laser-induced fluorescence spectroscopy of jet-cooled WO in 18, 900–23, 500 cm−1
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DOI：
10.1016/j.jms.2019.04.006
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发表时间：
2019-06
影响因子：
1.4
通讯作者：
Jicai Zhang;Dongmei Zhao;Xinwen Ma;Jie Yang
中科院分区：
文献类型：
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作者：
Jicai Zhang;Dongmei Zhao;Xinwen Ma;Jie Yang
利用激光烧蚀钨靶和氧自由射流膨胀反应，在18，900 - 23，500 cm-1能量范围内记录了WO分子的激光诱导荧光（LIF）激发光谱。共观察到63个电子跃迁带，其中8个跃迁带的基态为X 0+态，2个跃迁带的基态为X1态。通过激光诱导荧光光谱新发现了[21.5]0 ~+-X ~ 0 ~+和[23.3]1-X ~ 0 ~+两个电子跃迁体系。通过对光谱的转动分析，得到了分子在电子激发态的转动常数、振动频率和振动非谐常数。此外，通过对荧光衰减的指数拟合，测量了无碰撞条件下电子振动态的荧光寿命。
The laser-induced fluorescence (LIF) excitation spectra of WO molecule have been recorded in the energy range of 18,900–23,500 cm−1using laser ablation of tungsten target and reaction with free jet expansion of oxygen. Totally 63 vibronic transition bands were observed, and 60 bands were grouped into 10 electronic transition progressions, where 8 electronic transition progressions have the X0+state as the lower state, as well as 2 progressions have the X1 state as the lower state. The electronic transition systems [21.5]0+–X0+and [23.3]1–X0+were newly identified by LIF spectroscopy. The molecular constants, including rotational constant, vibrational frequency, vibrational anharmonic constant, in the electronic excited states were obtained through rotational analysis of the spectra. In addition, the fluorescence lifetimes of the vibronic states were measured under the collision-free condition by exponentially fitting the fluorescence decay.