The Amidogen Dication, NH

NH2 dications were formed by ionizing NH2 by collision with N atoms according to NH2+N- NH2 + N + e [1]. ions were also formed in a 100-eV electron-impact 

The five-valence-electron dication is linear (D h symmetry) in the electronic 

The excitation energy Tq = 0.9 0.2 eV from the ground state X B to the first excited metastable state Zg was obtained from the translational energy spectrum of 6-keV 

The high value of the enthalpy of formation AfH°(NHf ) = 3636 kJ/mol estimated from thermodynamic data indicates an extreme thermodynamic instability [6]. Ab initio calculations of the deprotonation NHi ( rTu)- NH ( n) + gave a highly exothermic energy of deprotonation, -452.3 [6], -423.0 to -454.4 kJ/mol [5, 7], and the respective values of the activation barrier of 41.0 [6], 60.5 to 47.7 kJ/mol [5, 7]. The relatively large activation barrier for deprotonation indicates a kinetically stable [6]. 

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