Potential energy curves of some electronic excited states of metal diatomic molecules using the energy consistent method

An analytical five-term expansion potential is suggested to improve the rec ently proposed energy consistent method (ECM) potential based on a three-te rm expansion [Weiguo Sun, Mel. Phys. 92, 105 (1997) and Weiguo Sun and Hao Feng, J. Phys. B: At. Mol. Opt. Phys. 32, 5109 (1999)]. Applications of the new ECM to the electronic excited state 3(1)Pi of NaK, the excited state 2 3 Sigma (+)(g) of Na-2, and the excited states 3(1)Sigma (+)(u) and 3(1)Pi, of K-2 molecules show that the new ECM potential not only agrees excellent ly with the known Rydberg-Klein-Rees (RKR) data or accurate configuration i nteraction (CI) studies but also gives the potential data at the molecular asymptote and the dissociation region where experimental and quantum mechan ical studies may have difficulties. The new ECM can correct the artifact wh ich appeared in the three-term expansion potentials of both the previous EC M and the Huxley-Murrell-Sorbie (HMS) potential and can describe some state s to which both the previous ECM and the HMS fail. (C) 2000 Academic Press.