The double photoionisation of NH3using the triple coincidence (PEPIPICO) technique

A simple development of the PEPIPICO technique, utilising the continuum nature of synchrotron radiation, has been used to determine thresholds for fragmentation of NH 3 into the channels NH + 2 +H + (35.7 and 39.6 eV), NH + +H + and NH + +H + 2 (43.3 eV) and N + +H + (49.2 eV). The threshold of NH 2+ 3 metastable ion production has also been determined (33.7 eV).