High resolution spectra of the simplest Criegee intermediate CH2OO between 880 and 932 cm−1
Luo, Pei-Ling
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https://hdl.handle.net/2142/100486
Description
Title
High resolution spectra of the simplest Criegee intermediate CH2OO between 880 and 932 cm−1
Author(s)
Luo, Pei-Ling
Contributor(s)
Lee, Yuan-Pern
Endo, Yasuki
Issue Date
2018-06-20
Keyword(s)
Radicals
Abstract
The Criegee intermediates (CI) play critical roles in atmospheric chemistry. CH2OO is the simplest CI and its characterization is important for investigations of reaction mechanisms and molecular structure. In this work, high-resolution spectra of the OO-stretching (ν6) mode of CH2OO in the range of 880–932 cm−1have been recorded using a quantum cascade laser (QCL) system coupled with a multi-pass Herriott cell. The CH2OO was produced from the reaction of CH2I + O2 in a flowing mixture of CH2I2/O2 (1/213) at 3.2 Torr upon irradiation at 248 nm with an excimer laser. The spectrum was recorded by step-scanning the QCL with a step size of 0.0016 cm−1 ; its wavelength was calibrated with a C2H4 reference cell and a germanium etalon. Over one thousand lines were assigned and used for fitting of molecular constants of CH2OO. Furthermore, the rotational perturbations on the high-J levels of Ka = 3, Ka = 6, and Ka ≥ 11 were observed.
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