1. Proton-electron mass ratio from laser spectroscopy of HD+ at the part-per-trillion level
- Author
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M. Haidar, M. Germann, Wim Ubachs, Kjeld S. E. Eikema, Vladimir I. Korobov, Sayan Patra, F. M. J. Cozijn, Laurent Hilico, Jeroen C. J. Koelemeij, J.-Ph. Karr, Atoms, Molecules, Lasers, LaserLaB - Physics of Light, Vrije Universiteit Amsterdam [Amsterdam] (VU), Laboratoire Kastler Brossel (LKB [Collège de France]), Fédération de recherche du Département de physique de l'Ecole Normale Supérieure - ENS Paris (FRDPENS), École normale supérieure - Paris (ENS-PSL), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-École normale supérieure - Paris (ENS-PSL), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-Collège de France (CdF (institution))-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), Université d'Évry-Val-d'Essonne (UEVE), Bogoliubov Laboratory of Theoretical Physics [Dubna] (BLTP), and Joint Institute for Nuclear Research (JINR)
- Subjects
Atomic Physics (physics.atom-ph) ,Penning trap ,Nuclear Theory ,FOS: Physical sciences ,01 natural sciences ,Physics - Atomic Physics ,010305 fluids & plasmas ,Ab initio quantum chemistry methods ,0103 physical sciences ,ground state ,Physics::Atomic Physics ,Nuclear Experiment ,010306 general physics ,Spectroscopy ,two-photon ,Physics ,Multidisciplinary ,transition ,Mass ratio ,Quantum number ,Proton-to-electron mass ratio ,[PHYS.PHYS.PHYS-GEN-PH]Physics [physics]/Physics [physics]/General Physics [physics.gen-ph] ,laser ,Deuterium ,frequency ,hydrogen ,mass ratio ,ion ,Atomic physics ,Ground state - Abstract
A very precise ratio The value of the ratio of the masses of the proton and the electron has a bearing on the values of other physical constants. This ratio is known to a very high precision. Patra et al. improved this precision even further by measuring particular frequencies in the rovibrational spectrum of the hydrogen deuteride molecular ion (HD + ) (see the Perspective by Hori). To reach this high precision, the researchers placed the HD + molecules in an ion trap and surrounded them by beryllium ions. The cold beryllium ions then helped cool the HD + molecules, making the HD + spectral lines narrow enough that the proton-electron mass ratio could be extracted by comparison with theoretical predictions. Science , this issue p. 1238 ; see also p. 1160
- Published
- 2020