Shifted Tietz–Wei oscillator for simulating the atomic interaction in diatomic molecules

The shifted Tietz–Wei (sTW) oscillator is asgood as traditional Morse potential in simulating theatomic interaction in diatomic molecules. By using thePekeris-type approximation, to deal with the centrifugalterm, we obtain the bound-state solutions of the radialSchro¨dinger equation with this typical molecular model viathe exact quantization rule (EQR). The energy spectrum fora set of diatomic molecules.