Vibrational levels and statistical analysis of the X(1Σg+) ground state of CS2
Vibrational levels and statistical analysis of the X(1Σg+) ground state of CS2
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CS2 X(1Σg+)基态的振动水平和统计分析
DOI：
10.1063/1.479174
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发表时间：
1999
期刊：
影响因子：
--
通讯作者：
W. Demtröder
中科院分区：
文献类型：
--
作者：
G. Brasen;W. Demtröder
利用倍频单模连续波(CW)染料激光器产生的紫外光激发冷分子束中CS2分子微扰1b2(1Δu)态的单振子能级。利用单色仪后面的液氮冷却电荷耦合器件阵列探测到的分散荧光光谱，可以确定X(1Σg+)态从(0，00，0)能级到20 000 cm−1的振动项值。基于包括费米共振在内的计算，大多数测量到的振动带可以归结为几个振动基态级数。对所有测量到的能级位置的统计分析表明，最近邻距离和Δ3统计数据均为纯泊松分布。这表明相邻振动能级之间没有很强的相关性，也不存在长程相互作用，因此与NO2和SO2的情况相反，没有发现混沌行为。
Single rovibronic levels in the perturbed 1B2(1Δu) state of CS2 molecules in a cold molecular beam were excited by ultraviolet (UV) photons from a frequency doubled single mode continuous wave (cw) dye laser. The dispersed fluorescence spectrum, detected by a liquid nitrogen (LN) cooled charge coupled device (CCD) array behind a monochromator allowed the determination of vibrational term values in the X(1Σg+) state from the (0,00,0) level up to 20 000 cm−1. Based on calculations including Fermi resonances, most of the measured vibrational bands could be assigned to several vibronic ground state level progressions. A statistical analysis of the positions of all measured levels shows for the nearest neighbor distances and the Δ3 statistics a pure Poissonian distribution. This indicates that no strong correlation between neighboring vibrational levels nor long range interactions are present and therefore no chaotic behavior could be found in contrast to the cases of NO2 and SO2.