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We find a proper quantization rule,where n is the number of the nodes of wave function ψ(x). By this rule the energy spectra of a solvable system can be determined from its ground-state energy only. Particularly, we study three solvable quantum systems -modified Rosen-Morse potential, symmetric trigonometric Rosen-Morse potential and Manning-Rosen potential in D dimensions-with the proper quantization rule, and show that the previous complicated and tedious calculations can be greatly simplified. This proper quantization rule applies to any exactly solvable potential, and one can easily obtain its energy spectra with the rule. This work is dedicated to Professor Zhong-Qi Ma on the occasion of his 70th birthday.

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We present a new approximate scheme to the centrifugal term and then apply this new approach to solve the Schrödinger equation with the Manning-Rosen potential. The bound state energy levels are obtained. A closed form of normalization constant of the wavefunctions is also found. It is shown that the present results are much better than those obtained previously and are in good agreement with the accurate numerical results obtained by a MATHEMATICA package.

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