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The adiabatic coupling correction term [Formula: see text] has been evaluated by two methods, the one used by Kołos and Wolniewicz in 1964 and the one suggested by Kari, Chan, Hunter, and Pritchard in 1973. The difference between the two procedures for H 2  amounts to 0.04 cm −1  and is almost independent of internuclear separation in the range R = 1.0–1.8 a.u. Thus, the method of computing the Δ R -term does not affect the vibrational energy level spacings.

A re-examination of the adiabatic correction term for the hydrogen molecule