The Ã-X̃ band system of acetylene: Analysis of medium-wavelength bands, and vibration-rotation constants for the levels nν′3 (n = 4–6), ν′2 + nν′3 (n = 3–5), and ν′1 + nν′3 (n = 2, 3)
The Ã-X̃ band system of acetylene: Analysis of medium-wavelength bands, and vibration-rotation constants for the levels nν′3 (n = 4–6), ν′2 + nν′3 (n = 3–5), and ν′1 + nν′3 (n = 2, 3)
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乙炔的 à-X̃ 能带系统：中波长带分析，以及 nν′3 (n = 4–6)、ν′2 + nν′3 (n = 3–5) 能级的振动旋转常数，和 ν′1 + nν′3 (n = 2, 3)
DOI：
10.1016/0022-2852(85)90080-3
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发表时间：
1985
影响因子：
1.4
通讯作者：
J. Watson
中科院分区：
文献类型：
--
作者：
J. V. Craen;M. Herman;R. Colin;J. Watson
先前的研究[J.Mol.分光度计。Ã1Au(C2h)-X̃1Σg+(D∞h)电子跃迁的高分辨吸收光谱扩展到2 190-2 0 5 0ä.指定了Aν态的振动能级nν‘3(n=4-6)、ν’2+nν‘3(n=3-5)和ν’1+ñ‘3(n=2-3)。这些能级和另一个未知能级被观测为基态的已知ν“4(πg)振动模式中振动进程的上态。对所有这些带进行了详细的旋转分析。这些上态振动能级中的每一个的转动能级都受到与未知振动能级的相互作用的干扰，这些未知振动能级可能也属于Ã电子态。因此，只能得到近似的上振转常数。
The previous study [J. Mol. Spectrosc. 95, 101–132 (1982)] of the high-resolution absorption spectrum of the A ̃ 1 A u (C 2h)-X ̃ 1 Σ g+(D∞ h) electronic transition of C 2 H 2 is extended to the region 2190-2050 Å. The vibrational levels nν′ 3 (n= 4–6), ν′ 2+ nν′ 3 (n= 3–5), and ν′ 1+ nν′ 3 (n= 2–3) of the A ̃ state are assigned. These levels and another unidentified level are observed as upper states of vibrational progressions in the known ν ″4 (π g) vibrational mode of the ground state. Detailed rotational analyses of all these bands are performed. The rotational levels of each of these upper state vibrational levels are perturbed by interactions with unidentified vibronic levels, which probably also belong to the A ̃ electronic state. As a result, only approximate upper rovibrational constants are obtained.