Abstract
High frequency pure rotational transitions of the simplest Criegee intermediate, methylene peroxide (CH2OO), have been measured up to 1THz. The data provide the most accurate spectroscopic parameters for the ground vibrational state. The molecule was produced in a flow cell with a DC discharge of CH2I2, O2 and Ar. Doppler limited measurements were made in the frequency ranges 220–320, 580–680 and 970–1080GHz. A total of 211 transitions were measured and added to four transitions measured in the microwave to obtain a fit up to Jmax=49 and Kamax=14 of the a-dipole spectrum.
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