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Abstract
Tetranitrogen (N4), which has been the subject of great theoretical interest, has been prepared from the N4 + cation and positively detected as a gaseous metastable molecule with a lifetime exceeding 1 microsecond in experiments based on neutralization-reionization mass spectrometry. An examination of the geometry of N4 + and the fragmentation pattern of the14N2 15N2 neutral molecule has revealed that the latter is characterized by an open-chain geometry with two distinct, closely bound N2 units joined by a longer weaker bond.
↵* To whom correspondence should be addressed. E-mail: fulvio.cacace{at}uniroma1.it
