Spectroscopic investigation reveals rotational transitions of vibrationally excited CH2OO across 250 to 500 GHz, demonstrating high-precision time-resolved detection of transient atmospheric radicals.
In the present work, we have investigated the rotational spectrum of the ν7 = 1 vibrational state of CH2OO in the 250–500 GHz range, produced by photolysis of the CH2I2 precursor in the presence of O2. In order to carry out such an investigation, we have developed a new experimental setup that combines UV pulsed laser photolysis and a room-temperature flow cell with a Fourier-transform millimeter-wave emission spectrometer. A multiple-pulse acquisition protocol enables time-resolved detection of transient species over millisecond time scales to improve signal-to-noise ratios through averaging. This system enables in situ observation of transient species and their vibrationally excited states under thermal conditions, demonstrating the capabilities of a new instrument that can record time-resolved rotational spectra. A total of 120 transitions were measured and used to determine accurate spectroscopic parameters for CH2OO (ν7 = 1).
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Chen et al. (2026) studied this question.
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