Fluorescence excitation spectroscopy of the Ar–HCO(X̃ 2A′,B̃ 2A′) van der Waals complex
Fluorescence excitation spectroscopy of the Ar–HCO(X̃ 2A′,B̃ 2A′) van der Waals complex
复制标题
Ar–HCO(X̃ 2A′,B̃ 2A′) 范德华配合物的荧光激发光谱
DOI：
10.1063/1.474469
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发表时间：
1997
期刊：
影响因子：
--
通讯作者：
P. Dagdigian
中科院分区：
文献类型：
--
作者：
S. Wright;P. Dagdigian
报道了Ar-HCO货车范德华络合物在HCO的B 2 A′-X2 A′ 0 0 0带附近的荧光激发光谱。已检测到至少八个与复合物相关的条带。从最低能量Ar-HCO带从自由HCO跃迁原点的光谱位移，我们估计激发电子态的Ar-HCO结合能至少比基态大13 cm −1。已进行的一些频带的旋转分析，并确定在两个电子状态的平均Ar-HCO分离（1.37A）。其中几个谱带被认为是来自基态第一激发弯曲-伸缩能级（K ″ =1）的热谱带。从推导出的A转动常数，我们得出结论，阿科框架有一个近似T形的几何形状在两个电子状态。最强的Ar-HCO带的上状态的衰变寿命进行了测量，并被发现是稍小于那些先前测量的低旋转水平的自由HCO。由于本研究中的高信噪比，还可以观察到游离H 13 CO同位素异构体中的跃迁。对H13 CO同位素的B 2 A′-X2 A′ 0 0 0带进行了转动分析.还测量了301和201带的同位素位移，并进行了HCO（B）的正常模式分析。
The fluorescence excitation spectrum of the Ar–HCO van der Waals complex in the vicinity of the B 2 A′–X 2 A′ 0 0 0 band of free HCO is reported. At least eight bands associated with the complex have been detected. From the spectral shift of the lowest energy Ar–HCO band from the origin of the free HCO transition, we estimate the Ar–HCO binding energy in the excited electronic state to be at least 13 cm −1 greater than that in the ground state. Rotational analysis of some of the bands has been carried out, and average Ar–HCO separations (∼3.7 A) in both electronic states determined. Several of the bands were assigned as hot bands from the first excited bend–stretch level (K ″ =1) in the ground electronic state. From the derived A rotational constants, we conclude that the ArCO framework has an approximately T-shaped geometry in both electronic states. The decay lifetime of the upper state of the strongest Ar–HCO band was measured and was found to be somewhat smaller than those previously measured for low rotational levels of free HCO. With the high signal-to-noise ratio in this study, it was also possible to observe transitions in the free H 13 CO isotopomer. A rotational analysis of the B 2 A′–X 2 A′ 0 0 0 band of the H 13 CO isotopomer was carried out. The isotopic shifts of the origins of the 3 0 1 and 2 0 1 bands were also measured, and a normal mode analysis of HCO (B) was carried out.