Two-photon frequency comb spectroscopy of atomic hydrogen
Sorting out physics the spend of the hydrogen atom
Discrepancy between the proton radius particular from hydrogen and muonic hydrogen spectroscopy data, the so-called “proton radius puzzle,” has been a focal point of the physics team for bigger than a decade now. Using two-photon ultraviolet frequency comb spectroscopy below 1 kilohertz, Grinin et al. document a excessive-precision size of the 1S-3S transition frequency in atomic hydrogen (stare the Standpoint by Ubachs). Combining this size with the data for the 1S-2S transition, the authors obtained the Rydberg constant with improved accuracy and an self reliant fee for the proton fee radius that favors the data from muonic hydrogen. Alternatively, the recent frequency fee differs from the one obtained previously the spend of a reasonably about a spectroscopic formula, leaving the puzzle serene unresolved.
Summary
Now we like performed two-photon ultraviolet impart frequency comb spectroscopy on the 1S-3S transition in atomic hydrogen to gentle up the so-called proton radius puzzle and to label the skill of this formula. The proton radius puzzle is a well-known discrepancy between data obtained with muonic hydrogen and smartly-liked atomic hydrogen that might maybe well well also not be defined within the framework of quantum electrodynamics. By combining our consequence [f1S-3S = 2,922,743,278,665.79(72) kilohertz] with a old size of the 1S-2S transition frequency, we obtained original values for the Rydberg constant [R∞ = 10,973,731.568226(38) per meter] and the proton fee radius [rp = 0.8482(38) femtometers]. This consequence favors the muonic fee over the enviornment-common data as presented by the most recent printed CODATA 2014 adjustment.