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On the basis of the deformable body model and the Morse potential approximation a six-parametric spectral expansion of the rovibrational energy of diatomic molecules, competitive to the standard Dunham approach, is proposed. The considered formula takes into account the centrifugal distortion effect and anharmonic corrections, which permit investigation of the molecular spectra over a wide range of rotational and vibrational states. PACS numbers: 33.10.Cs, 33.10.Jz

Spectral Expansion of the Rovibrational Energy of Diatomic Molecules Described by Morse Potential