Two‐photon spectroscopy of Rydberg states of jet‐cooled C2H4 and C2D4
Two‐photon spectroscopy of Rydberg states of jet‐cooled C2H4 and C2D4
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喷射冷却 C2H4 和 C2D4 里德伯态的双光子光谱
DOI：
10.1063/1.460314
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发表时间：
1991
影响因子：
4.4
通讯作者：
T. Cool
中科院分区：
文献类型：
--
作者：
B. A. Williams;T. Cool
报道了喷射冷却 C2H4 和 C2D4 的 (π,3s)、(π,3p) 和 (π,nf ) (n=4–18) Rydberg 态双光子共振带的光谱研究。新的电子振动能带通过这些低温（<10 K）观测得到解析，并且先前的双光子 3s 和 3p 跃迁的电子振动分配得到了证实。在 3s 光谱中观察到新的振动进展，暂时分配给双光子允许的 1B2g←1Ag 跃迁，通过激发 b1u ν6 CH2 反对称剪刀模式振动诱导。偏振比测量和先前未报道的 3pσ 原带的识别表明 3p 能级的能量与理论预测非常一致。没有观察到 s-和 p-里德伯系列的较高位置成员，这表明强预解离的开始。对双光子的这些首次观测允许 nf-Rydberg 系列产生 C2H4 的电离势估计为 84 799±5 cm−1，C2D4 的电离势估计为 84 918±5 cm−1，比较有利...
Spectroscopic studies of two‐photon resonant vibronic bands of the (π,3s), (π,3p), and (π,nf ) (n=4–18) Rydberg states of jet‐cooled C2H4 and C2D4 are reported. New vibronic bands are resolved by these low temperature (<10 K) observations and previous vibronic assignments of two‐photon 3s and 3p transitions are confirmed. A new vibronic progression is observed in the 3s spectrum, tentatively assigned to two‐photon allowed 1B2g←1Ag transitions, vibronically induced via excitation of the b1u ν6 CH2 antisymmetric scissors mode. Polarization ratio measurements and identification of the previously unreported 3pσ origin band show that the energies of the 3p levels are in good agreement with theoretical predictions. Higher‐lying members of the s‐ and p‐Rydberg series are not observed, suggestive of the onset of strong predissociation. These first observations of the two‐photon allowed nf‐Rydberg series yield ionization potential estimates of 84 799±5 cm−1 for C2H4 and 84 918±5 cm−1 for C2D4 that compare favorabl...