Polyansky, O.; Zobov, N.F.; Alijah, A.; Tennyson, J.; Lodi, L. QED CORRECTION FOR H3+. Proceedings of the International Symposium on Molecular Spectroscopy, Urbana, IL, June 16-21, 2014.
A quantum electrodynamics (QED) correction surface
for the simplest polyatomic and polyelectronic system
H$_3^+$ is computed using an approximate procedure.
This surface is used to calculate the shifts
to vibration-rotation energy levels due to QED;
such shifts have a magnitude of up to 0.25~cm$^{-1}$
for vibrational levels up to 15~000~cm$^{-1}$ and are
expected to have an accuracy of about 0.02~$^{-1}$.
Combining the new H$_3^+$ QED correction surface with existing
highly accurate Born-Oppenheimer (BO), relativistic
and adiabatic components
suggests that deviations of the resulting {\it ab
initio} energy levels from observed ones
are largely due to non-adiabatic effects.