Derya Taray 31.05.2021 1s – 3s Online - Labtour D. Taray Online Labtour 2021 Hydrogen spectroscopy ) Rydberg constant Determined from H spectroscopy Fine electron – structure proton constant mass ratio Measured with high precision in Penning trap and atom interferometry experiments 1S–2S= 2 466 061 413 187 035 (10) Hz CG Parthey et al. PRL 107, 203001, 2011 D. Taray Online Labtour 2021 RMS proton charge radius Determined from H spectroscopy Precision spectroscopy D. Taray Online Labtour 2021 1s – 3s spectroscopy D. Taray Online Labtour 2021 Two-Photon Direct Frequency Comb Spectroscopy D. Taray Online Labtour 2021 Two-Photon Direct Frequency Comb Spectroscopy D. Taray Online Labtour 2021 Laser system D. Taray Online Labtour 2021 Hydrogen Discharge D. Taray Online Labtour 2021