Rovibrational Spectra of the Polar and Nonpolar Nitrous Oxide Dimers

Rovibrational Spectra of the Polar and Nonpolar Nitrous Oxide Dimers
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极性和非极性一氧化二氮二聚体的旋转振动光谱

DOI:
10.1080/00387010.2013.850438
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发表时间:
2015-03
影响因子:
1.7
通讯作者:
郑锐
郑锐
中科院分区:
化学4区
文献类型:
--
作者:
郑锐

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利用可调谐红外激光器探测脉冲超音速狭缝射流,对非极性氧化亚氮二聚体的振动谱进行了扩展测量。几乎400个新的转换已经被分配覆盖(J, K a)值到(28,10)。除了和1的跃迁外,在该波段还广泛观察到幅度大得多的扰动。排除最小二乘拟合中具有扰动的跃迁,使用Watson a -约简的不对称转子哈密顿量分析指定的跃迁以及先前在该区域观测到的数据,并确定了一组改进的分子参数,用于基态和激发态。此外,Berner et al.(2009)研究过的一种极性异构体在氧化亚氮单体ν3区域的红外光谱也在该区域进行了观察和分析。45个旋转转变被分配为一个混合带,同时具有a型和b型旋转转变。振动源为1280.0027(2)cm−1,与N2O单体带源红移4.9 cm−1。
The extended measurement of rovibrational spectrum of nonpolar nitrous oxide dimer has been carried out using a tunable infrared laser to probe a pulsed supersonic slit jet. Almost 400 new transitions have been assigned covering (J, K a ) values up to (28, 10). Besides the transitions with and 1, the perturbations with much larger magnitude are widely observed in this band. Excluding the transitions with perturbations in a least-square fit, the assigned transitions together with the data observed previously in this region are analyzed using a Watson A-reduced asymmetric rotor Hamiltonian and a set of improved molecular parameters is determined for both ground and excited vibrational states. Furthermore, the infrared spectrum of a polar isomer, which has been studied by Berner et al. (2009) in the ν3 region of nitrous oxide monomer, is also observed and analyzed in this region. Forty-five rotational transitions are assigned as a hybrid band with both a- and b-type rotational transitions. The vibrational origin is determined to be 1280.0027(2) cm−1, which shows a red-shift of 4.9 cm−1 from the band origin of N2O monomer.
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