Title: Long-Range Interactions for Hydrogen: 6P-1S and 6P-2S,
Abstract: The collisional shift of a transition constitutes an important systematic
effect in high-precision spectroscopy. Accurate values for van der
Waalsinteraction coefficients are required in order to evaluate the
distance-dependent frequency shift. We here consider the interaction of excited
hydrogen 6P atoms with metastable atoms (in the 2S state), in order to explore
the influence of quasi-degenerate 2P, and 6S states on the dipole-dipole
interaction. The motivation for the calculation is given by planned
high-precision measurements of the transition. Due to the presence of
quasi-degenerate levels, one can use the non-retarded approximation for the
interaction terms over wide distance ranges.