Abstract
A variational procedure is described for the computation of the non-adiabatic mass-correction matrix applicable for multi-dimensional electronic manifolds. The 30-year-old computations of Wolniewicz, Dressler, and their co-workers are appended with the computed vibronic mass-correction functions corresponding to the EF–GK–H–S5–S6
manifold of the hydrogen molecule. Initial results are reported for the vibronic energies. Necessary further improvements and further developments are discussed.
GRAPHICAL ABSTRACT
![](/cms/asset/87a5d46b-dd1e-43b6-b9ef-e8407095f5e5/tmph_a_2074905_uf0001_oc.jpg)
Acknowledgments
EM thanks Stefan Teufel for discussions about adiabatic perturbation theory.
Disclosure statement
No potential conflict of interest was reported by the author(s).