Knowledge Bank

A mid-infrared spectrum of the CH$3$OO radical at room temperature has been measured by Fourier-transform infrared spectroscopy. The CH$3$OO radicals were produced by photolysis of a CH$3$I/O$2$ mixture at 248 nm or a CH3COCH3/O2 mixture at 193 nm; the total pressure is ~100 Torr and the precursor is about 1.6-2.0%. The $\nu 2$, $\nu 5$, $\nu 6$, $\nu 7$, and $\nu 9$ fundamental bands with origins at 2954.0, 1182.6, 1118.0, 910.8, and 3021.4 cm$\mathrm{<mrow\; data-mjx-texclass="ORD">-1</mrow>}$ have been observed, which are in good agreement with previous low-resolution work. \textbf{127}, 7 (2007)} Particular attention has been given to simulate the rotational structure of the $\nu 2$ band. Sequence band structure from the methyl torsion mode $\nu 12$ was included in the simulation of this band as well as some transitions from the precursor. The simulation shows generally good consistency with the experimental spectrum and allows the determination of the molecule's rotational constants.