Finite Nuclear Mass Effects on the Centrifugal Stretching Constant in H35Cl

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Abstract
It is suggested that the existing discrepancy between the experimentally determined H35Cl energy‐level constant Y02 and its value, as predicted through Dunham's theory, represents a deviation from Born—Oppenheimer behavior. Relationships between 1Σ‐state molecular energy‐level constants, corrected to take account of deviations from Born—Oppenheimer behavior, are then used in a recalculation of the Dunham theoretical value for Y02. The discrepancy is not removed through the present calculation, however. The fractional difference between the Dunham values with and without corrections for deviations from Born—Oppenheimer behavior is −0.29×10−3, as opposed to the fractional difference (0.649±0.065)×10−3 between the experimental and (uncorrected) Dunham theoretical values. The importance of the present calculation to an accurate spectroscopic determination of the velocity of light is indicated.