Abstract
The potential‐energy curves of the excited states of NaH and KH have been obtained by the Rydberg‐Klein‐Rees method as described by Singh and Jain. The simple‐harmonic curves and ionic curves for LiH, NaH, KH, and RbH have also been calculated. It has been found that the potential‐energy curves mostly agree with Mulliken's findings as to the anomalous behavior of the excited states of alkali hydrides.