Abstract
AbstractThe appearance potentials for the transition ([HNCO]+·→ [HCO]+ + N), determined for the reaction in the ion source and in the first field free region (15·84 and 15·52 eV) correspond, respectively, to the vertical and adiabatic third ionisation potential of HNCO, as determined by photoelectron spectroscopy. The formyl ion and nitrogen radical are formed in the ground state, which requires predissociation of a quartet molecular ion of HNCO.A heat of formation δHf(HNCO)g = −25 ± 3 kcal mol·1 was determined from the appearance potential and kinetic energy release for the metastable ion [HCO]+, and from the difference in appearance potentials for the ion [NH]+· produced from the isoelectronic molecules HNCO and HN3.
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