Abstract
Quantum-electrodynamics (QED) theory has been tested with high accuracy [1]. However, QED tests in atomic hydrogen are currently limited by the experimentally determined value of the proton charge radius. Therefore spectroscopic measurements were conducted with muonic-atoms (μH and μD) to determine the proton and the deuteron charge radii with an order of magnitude higher accuracy. However, these values also showed a > 7σ discrepancy with the CODATA-2010 values [2]. In order to contribute to resolving this so called proton radius puzzle we have determined the EF←X transition frequency in molecular hydrogen (H2) at ~ 2 × 202 nm with almost two orders of magnitude higher accuracy than the previous result [3]. We are also building a setup to measure the 1S-2S transition in singly ionized helium at ~ 30 nm.
© 2017 IEEE
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