Abstract
A potential energy surface for the electronic ground state of N 2O is optimized using a variational procedure with an exact vibrational Hamiltonian. In the optimization, the ab initio force field of Martin, Taylor and Lee is taken as a starting point, and the observed vibrational band origins up to 15000 cm −1 reported by Campargue and co-workers are involved. The RMS error of this fitting to the 60 observed Σ state vibrational energy levels is 0.34 cm −1. The rovibrational energy levels for the Σ and Π vibrational states are calculated to test the refined potential.
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