Abstract:

 Using Gaussian 92 ab initio computer program, at the UMP2 level with a 6-311G* basis set, the equilibrium geometries of the ionic clusters N+2He, N+2He2 and N2+He3 have been optimized and identified through the analysis of vibrational frequencies.Dissociation energies of the three ionic clusters have been calculated at the UQCISD/6-311G**/UMP2/6-311G* level, and rotation potential barriers of N2+ in these clusters have been estimated at the UHF/6-311G* level indicating that N2+ can freely rotate in the Helium atmosphere. In addition, the excitation energy of B←X of N2＋He has been computed at the UCIS/6-311G* level. These results are in good agreement with the results obtained by Maier et al.

Key words: The ionic cluster;The equilibrium geometry;Rotation potential barrier;Dissociation energy