Conveners
Session 1: Precision spectroscopy of atoms and ions
- Savely Karshenboim (LMU, MPW, Pulkovo Obs.)
We consider recent experiments in the spectroscopy of the HD+ hydrogen molecular ion [1,2] as well as most recent achievements in theory. We want to show how the Rydberg constant may be deduced from theory-experiment comparison with a relative uncertainty close to 15 ppt.
[1] S.Alighanbari, M.G.Hansen, V.I.Korobov, and S.Schiller, Rotational spectroscopy of cold, trapped molecular ions in the...
The hydrogen molecular ions H2+ and HD+ are promising systems for fundamental constants metrology. Their spectrum offer many ultra-narrow ro-vibrational transitions, the frequencies of which are sensitive to the proton-electron mass ratio, proton charge radius, and Rydberg constant [1]. Several projects aiming at high-accuracy measurements using Doppler-free spectroscopy schemes [2-4] are in...
I report on progress in the calculation of corrections to positronium energy levels of order $m \alpha^7$. Corrections at this level will be needed for the interpretation of the results of upcoming measurements. A procedure for the calculation of high order corrections has been developed based on the Bethe-Salpeter equation of dimensionally regularized NRQED and the method of regions. I...
