Knowledge Bank

The $\nu 1$ CH stretch, a previously uncharacterized mode of the ketenyl (HCCO) radical, was detected at 3230cm$\mathrm{<mrow\; data-mjx-texclass="ORD">-1</mrow>}$ through time-resolved Fourier transform infrared emission spectroscopy. Ro-vibrationally excited ketenyl and ethyl (CH$2$CH$3$) radicals were generated, with near unit quantum efficiency, via the 193 nm photodissociation of ethyl ethynyl ether }. \vspace{1em} \begin{center} HCC-O- CH$2$CH$3$ + h$\nu$ (193 nm) \rightarrow HCCO + CH$2$CH$3$ \ \end{center} \vspace{1em} IR emission from the photoproducts was detected with both temporal and frequency resolution. Spectral assignments were made based upon comparison with theoretical calculations as well as 2D correlation analysis}.