Nonpolar nitrous oxide dimer: observation of combination bands of (14N2O)2 and (15N2O)2 involving the torsion and antigeared bending modes.
Nonpolar nitrous oxide dimer: observation of combination bands of (14N2O)2 and (15N2O)2 involving the torsion and antigeared bending modes.
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DOI：
10.1063/1.3697869
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发表时间：
2012-03
期刊：
影响因子：
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通讯作者：
M. Rezaei;K. Michaelian;N. Moazzen-Ahmadi
中科院分区：
文献类型：
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作者：
M. Rezaei;K. Michaelian;N. Moazzen-Ahmadi
在超音速缝隙喷流装置中观测到了N(2)Oν(1)基带区域的非极性氧化亚氮二聚体的光谱。利用量子级联或可调谐半导体激光器的辐射探测膨胀气体，这两种激光器都采用快扫描信号平均模式。观察和分析了四条谱带：(14)N(2)O(2)和(15)N(2)(2)的新的涉及单体分子间共转的谱带(A(G)反齿轮弯曲)，(14)N(2)(2)的扭转结合带，以及(15)N(2)O(2)的相同扭转结合带。(14)N(2)O(2)和(15)N(2)O(2)的分子间反齿轮模式的频率分别为96.0926(1)和95.4912(1)cm(-1)。这是目前已经实验测量的四个分子间频率中的第三个频率，其他的是平面外扭转和齿轮弯曲模式。我们的实验结果与最近的两个高水平从头算理论计算很好地吻合。
Spectra of the nonpolar nitrous oxide dimer in the region of the N(2)O ν(1) fundamental band were observed in a supersonic slit-jet apparatus. The expansion gas was probed using radiation from a quantum cascade or a tunable diode laser, with both lasers employed in a rapid-scan signal averaging mode. Four bands were observed and analyzed: new combination bands involving the intermolecular conrotation of the monomers (A(g) antigeared bend) for ((14)N(2)O)(2) and ((15)N(2)O)(2), the previously reported torsional combination band for ((14)N(2)O)(2) with improved signal-to-noise ratio, and the same torsional combination band for ((15)N(2)O)(2). The resulting frequencies for the intermolecular antigeared mode are 96.0926(1) and 95.4912(1) cm(-1) for ((14)N(2)O)(2) and ((15)N(2)O)(2), respectively. This is the third of the four intermolecular frequencies which has now been measured experimentally, the others being the out-of-plane torsion and the geared bend modes. Our experimental results are in good agreement with two recent high level ab initio theoretical calculations.