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The value of adjustable parameter $C$ and the four-parameter potential $U(r)= D_{e}\left [ \frac{1-{exp}[-b(r-r_{e})]}{1-C{exp} [-b(r-r_{e})]} \right]^{2}$ has been expressed in terms of molecular parameters and its significancehas been brought out. The potential so constructed, with $C$ derived from themolecular parameters, has been applied to ten electronic states in addition tothe states studied by Wei Hua. Average mean deviation has been found to be 3.47as compared to 6.93, 6.95 and 9.72 obtained from Levine2, Varshni and Morsepotentials, respectively. Also Dunham's method has been used to expressrotation-vibration interaction constant $(\alpha_{e})$ and anharmonocityconstant $(\omega_{e}x_{e})$ in terms of $C$ and other molecular constants.These relations have been employed to determine these quantities for 37electronic states. For $\alpha_{e}$, the average mean deviation is 7.2%compared to 19.7% for Lippincott's potential which is known to be the best topredict the values. Average mean deviation for $(\omega_{e}x_{e})$ turns out tobe 17.4% which is almost the same as found from Lippincott's potentialfunction.Comment: 19 RevTex Pages, 1 Ps figure, submitted to J. Phys.

Wei Hua’s four-parameter potential: Comments and computation of molecular constants αe and εeXe