Dissociation of N2O+ ions from the valence states reached by one-photon photoionisation

The dissociation of N2O+ from the states reached by one-photon ionisation a t 58.4 and 30.4 nm has been examined by photoelectron-photoion coincidence spectroscopy. At 30.4 nm, ions formed in some inner valence states dissocia te rapidly enough to show a forward/backward asymmetry between the electron and fragment ion ejection directions. In the 19 to 20 eV energy region, th e dissociation characteristics suggest the existence of an additional elect ronic state. The kinetic energy releases identify the final channels in dis sociation from several states; the energy releases in N-2(+) formation from states in the inner valence region are consistent with known fluorescence emission from N-2(+) (B (2)Sigma(u)(+)) fragments and suggest that emission s from N-2(+) (A (IIu)-I-2) may also be present. (C) 1999 Elsevier Science B.V.