In line 4, read "0" in place of "2. " On page 671, Linnett function, Eq. (55) should read (m+1) (m-1)-t2+3t 6B ' 3 (m+1t) co, Equation (II-29) should read

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A new potential-energy function has been suggested for the alkali halide molecules, U=(−e2/r)+Pexp(−kr2),where P and k are constants. Values of αe, ωeχe, and the ionic binding energy Di have been derived for the following three functions: (1) simple Born-Mayer potential, (2) Rittner potential, and (3) the above suggested potential. The results obtained with the new function are much better than those obtained with the Born-Mayer potential, but slightly inferior to those obtained with the Rittner potential.

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The WKBJ method is applied to the third order for obtaining the eigenvalues for the fifth potential of Vz~rshni, and the relevant integrals are analytically evaluated. Numel-ical results are obtained for the Lennard-Jones potential. which is a special case of the Val-shni V potential, and are compared to the resultsof Harrison and Bernstein obtained by a numeric;ll integration of the wave equation. Error estimates are made. It is shown that for diatomic potentials, the Langer correction is not needed if the WKBJ approximation is carried to second and higherorders.On ;~pplique Is methode WKBJ au troisieme 01-dl-e pour obtenir les valeurs propres du cinquieme potentiel de Varshni, et on evalue an;~lytiquement les integrales pertinentes. On obtient des resultats numeriques pour le potentiel Lennnrd-Jones, qui est un cas special du potentiel V. ,~rshni .. V, et ces resultats sont compares h ceux que Harrison e t Bernstein ont obtenus par integration numerique de I'iquation d'onde. Des estim;~tions d'erreur sont faites. On montre que pour des potentiels diatomiques, la correction de Lnnger n'est pas I-equise si I'approximation WKBJ est poussee jusqu'au second ordre et aux ordres superieurs.[Traduit par le journal]Can.