| Abstract
| - Irradiations at λ > 180 nm and λ > 230 nm of CH3COCN (CD3COCN) trapped in an argon matrix at 10 Khave been performed and monitored by Fourier transform infrared spectroscopy. For both wavelengths, thefirst photoreaction product is acetyl isocyanide. At λ > 180 nm acetonitrile and methyl isocyanide are obtainedas final products. They are formed by photolysis of acetyl isocyanide and acetyl cyanide, respectively. Unstableintermediates, such as ketene:HCN and ketene:HNC complexes, H2CNCH zwitterion, and H2C2NH keteneimine,not observed in the gas phase, are trapped and identified at our experimental temperature. The complexeshave an L-shaped structure with a hydrogen bond between the oxygen atom of ketene and the hydrogen atomof HCN or HNC. A pathway process is proposed and compared with the ones determined in the ground stateby ab initio calculations.
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