Abstract
M(NO 3) x − ions are generated by electrospray ionization (ESI) of metal solutions in nitric acid in negative ion mode. Collision-induced reactions of these ions are monitored in a tandem mass spectrometer (MS) of quadrupole-octopole-quadrupole (QoQ) geometry. For Group 1and 2 elements, the M(NO 3) x − ions dissociate into NO 3 − and neutral metal nitrate molecules. These elements also form some M x (NO 3) x+1− clusters, especially Li +. Metal nitrate ions from transition elements and Group 13 elements fragment into oxo products and also undergo internal electron transfer to leave the M atom in a lower oxidation state. To calibrate the collision energy, the dissociation energy of O-NO 2 − is found to be 5.55 eV, about 0.76 eV lower than a value derived from thermochemistry. The product ions from Fe(NO 3) 4 − ions have low formation thresholds of only 0.5 to 2 eV.
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