化学
原子物理学
光谱学
从头算
从头算量子化学方法
分析化学(期刊)
吸收光谱法
吸收(声学)
谱线
激光器
级联
分辨率(逻辑)
物理
分子
光学
量子力学
色谱法
人工智能
有机化学
计算机科学
天文
作者
Yuan-Pin Chang,Anthony J. Merer,Hsun-Yun Chang,Li-Ji Jhang,Wen Chao,Jim J. Lin
摘要
The region 1273-1290 cm$^{-1}$ of the $\nu$4 fundamental of the simplest Criegee intermediate, CH$_2$OO, has been measured using a quantum cascade laser transient absorption spectrometer, which offers greater sensitivity and spectral resolution (< 0.004 cm$^{-1}$) than previous works based on thermal light sources. Gas phase CH$_2$OO was generated from the reaction of CH$_2$I + O2 at 298 K and 4 Torr. Analysis of the absorption spectrum has provided precise values for the vibrational frequency and the rotational constants, with fitting errors of a few MHz. The determined ratios of the rotational constants, A'/A" = 0.9986, B'/B" = 0.9974 and C'/C" = 1.0010, and the relative intensities of the a- and b-type transitions, 90:10, are in good agreement with literature values from a theoretical calculation using the MULTIMODE approach, based on a high-level ab initio potential energy surface. The low-K (= Ka) lines can be fitted extremely well, but rotational perturbations by other vibrational modes disrupt the structure for K = 4 and K $\geq$ 6. Not only the spectral resolution but also the detection sensitivity of CH$_2$OO IR transitions has been greatly improved in this work, allowing for unambiguous monitoring of CH$_2$OO in kinetic studies at low concentrations.
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