Report

Proton-electron mass ratio from laser spectroscopy of HD+ at the part-per-trillion level

See allHide authors and affiliations

Science  30 Jul 2020:
eaba0453
DOI: 10.1126/science.aba0453

You are currently viewing the abstract.

View Full Text

Log in to view the full text

Log in through your institution

Log in through your institution

Abstract

Recent mass measurements of light atomic nuclei in Penning traps have indicated possible inconsistencies in closely related physical constants like the proton-electron and deuteron-proton mass ratios. These quantities also influence the predicted vibrational spectrum of the deuterated molecular hydrogen ion in its electronic ground state. We measure the frequency of the v = 0→9 overtone transition of this spectrum with an uncertainty of 2.9 parts-per-trillion through Doppler-free two-photon laser spectroscopy. Leveraging high-precision ab initio calculations we convert our measurement to tight constraints on the proton-electron and deuteron-proton mass ratios, consistent with the most recent Penning-trap determinations of these quantities. This results in an unprecedented precision of 21 parts-per-trillion for the value of the proton-electron mass ratio.

View Full Text

Stay Connected to Science