Lin Yu-Shu, Chen Cheng-Chung, Chang Bor-Chen
Department of Chemistry, National Central University, Chung-Li 32001, Taiwan.
J Chem Phys. 2006 Jun 14;124(22):224322. doi: 10.1063/1.2206179.
The laser-induced fluorescence excitation spectrum of the GeCl(2) A-X transition at ultraviolet wavelengths (300-320 nm) was recorded in a direct current discharge supersonic free jet expansion. The excitation spectrum contains several sharp peaks and a congested diffuse structure. Dispersed fluorescence spectra following the excitation of these GeCl(2) ultraviolet bands were successfully acquired for the first time. The analysis of the dispersed fluorescence spectra reveals the detailed vibrational structure of the X (1)A(1) state. We have assigned the vibrational structures corresponding to different isotopomers (Ge(35)Cl(2), Ge(35)Cl(37)Cl, and Ge(37)Cl(2)). The vibrational fundamental frequencies were determined: 409 cm(-1) (symmetric stretch), 159 cm(-1) (bend), and 352 cm(-1) (antisymmetric stretch) for the X (1)A(1) state of GeCl(2). Vibrational parameters of the ground electronic state including vibrational frequencies, anharmonicity, and bend-stretch coupling constant were determined. Our dispersed fluorescence spectra also clarify the vibrational assignments of the hot bands and provide more experimental data for unraveling the nature of the congested diffuse structure at shorter wavelengths in the excitation spectrum.
在直流放电超声速自由射流膨胀中记录了GeCl(2) A-X跃迁在紫外波长（300 - 320 nm）的激光诱导荧光激发光谱。该激发光谱包含几个尖锐峰和一个密集的漫射结构。首次成功获得了这些GeCl(2)紫外带激发后的色散荧光光谱。对色散荧光光谱的分析揭示了X (1)A(1)态的详细振动结构。我们已经确定了对应于不同同位素异构体（Ge(35)Cl(2)、Ge(35)Cl(37)Cl和Ge(37)Cl(2)）的振动结构。确定了振动基频：对于GeCl(2)的X (1)A(1)态，对称伸缩振动为409 cm(-1)，弯曲振动为159 cm(-1)，反对称伸缩振动为352 cm(-1)。确定了基电子态的振动参数，包括振动频率、非谐性和弯曲 - 伸缩耦合常数。我们的色散荧光光谱还明确了热带的振动归属，并为揭示激发光谱中较短波长处密集漫射结构的本质提供了更多实验数据。
