The A-X band system of acetylene: Analysis of long-wavelength bands, and vibration-rotation constants for the levels nν4 (n = 0–4), nν3 (n = 0–3), and ν2 + nν3 (n = 0–2)
The A-X band system of acetylene: Analysis of long-wavelength bands, and vibration-rotation constants for the levels nν4 (n = 0–4), nν3 (n = 0–3), and ν2 + nν3 (n = 0–2)
复制标题
乙炔的 A-X 能带系统：长波长带分析，以及 nν4 (n = 0–4)、nν3 (n = 0–3) 和 ν2 + nν3 (n = 0–2) 能级的振动旋转常数）
DOI：
10.1016/0022-2852(82)90242-9
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发表时间：
1982
影响因子：
1.4
通讯作者：
R. Colin
中科院分区：
文献类型：
--
作者：
J. Watson;M. Herman;J. V. Craen;R. Colin
本文报道了乙炔的A ~ 2400 nm-X ~ 2400 nm吸收带系统的高分辨照相。详细分析了2470-2150- 100 - 1以前的一些分配被修改。综合最小二乘拟合包括ΔK=±1的主子带和ΔK= 0、±2（由于轴切换）和ΔK=±3（由于轴切换、不对称和l共振）的卫星子带。观察到ν ″4能级的所有l分量的转动能级，并与线性分子的l加倍和l共振理论相一致。用非对称的顶转动常数A v，B v，C v和主离心常数D v J，D v JK，D v K拟合了非线性A π态振动能级的转动结构。用未观测到的A π态振动频率讨论了ν′ 2+ ν′ 3的小扰动和惯性亏损Δ′ v。
Abstract The A ̃-X ̃ band system of acetylene with origin near 2400 Å was photographed in absorption with higher resolution than in previous studies. A detailed rotational analysis of bands in the 2470–2150-Å region, involving the levels nν ″4 (n= 0–4) of the X ̃ 1 Σ g+(D∞ h) state and nν′ 3 (n= 0–3) and ν′ 2+ nν′ 3 (n= 0–2) of the A ̃ 1 A u (C 2h) state, is presented. Some of the previous assignments are modified. Both the principal subbands with ΔK=±1 and the satellite subbands with ΔK= 0,±2 (due to axis-switching) and ΔK=±3 (due to axis-switching, asymmetry, and l resonance) are included in a comprehensive least-squares fit. Rotational levels of all the l components of the levels of ν ″4 are observed, and are consistent with the theory of l doubling and l resonance of a linear molecule. The rotational structures of the vibrational levels of the nonlinear A ̃ state are fitted with asymmetric top rotational constants A v, B v, C v and principal centrifugal constants D v J, D v JK, D v K. A small perturbation of ν′ 2+ ν′ 3, together with the inertial defect Δ′ v, are discussed in terms of the unobserved vibrational frequencies of the A ̃ state.