La photoionisation par spectrométrie de masse d'ions sélectionnés en énergie cinétique. La distribution en énergie translationnelle de N+/N2 dans le domaine d'énergie d'ionisation des couches internes.

An ion retarding potential difference (IRPD) method has been used to investigate the ion yield and the kinetic energy distributions of N+/N2 produced by photoionization mass spectrometry using synchrotron radiation. Photoion yield curves of energy selected N+ ions are deduced. Translational energy distributions of N+ at the energies of the N(1s)->pi*, N(1s)->(nl)1 and above the N(1s)-1 threshold are determined. Comparison is made with previous photoion-photoelectron coincidence work using time-of-flight (TOF) measurements