Proton-electron mass ratio by high-resolution optical spectroscopy of
ion ensembles in the resolved-carrier regime
- URL: http://arxiv.org/abs/2103.11741v2
- Date: Tue, 24 Aug 2021 07:58:37 GMT
- Title: Proton-electron mass ratio by high-resolution optical spectroscopy of
ion ensembles in the resolved-carrier regime
- Authors: I. V. Kortunov, S. Alighanbari, M. G. Hansen, G. S. Giri, V. I.
Korobov and S. Schiller
- Abstract summary: One-photon optical spectroscopy free of Doppler and transit broadening can be obtained with more easily prepared ensembles of ions.
We show that one-photon optical spectroscopy free of Doppler and transit broadening can also be obtained with more easily prepared ensembles of ions.
- Score: 0.0
- License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
- Abstract: Optical spectroscopy in the gas phase is a key tool to elucidate the
structure of atoms and molecules and of their interaction with external fields.
The line resolution is usually limited by a combination of first-order Doppler
broadening due to particle thermal motion and of a short transit time through
the excitation beam. For trapped particles, suitable laser cooling techniques
can lead to strong confinement (Lamb-Dicke regime, LDR) and thus to optical
spectroscopy free of these effects. For non-laser coolable spectroscopy ions,
this has so far only been achieved when trapping one or two atomic ions,
together with a single laser-coolable atomic ion [1,2]. Here we show that
one-photon optical spectroscopy free of Doppler and transit broadening can also
be obtained with more easily prepared ensembles of ions, if performed with
mid-infrared radiation. We demonstrate the method on molecular ions. We trap
approximately 100 molecular hydrogen ions (HD$^{+}$) within a Coulomb cluster
of a few thousand laser-cooled atomic ions and perform laser spectroscopy of
the fundamental vibrational transition. Transition frequencies were determined
with lowest uncertainty of 3.3$\times$10$^{-12}$ fractionally. As an
application, we determine the proton-electron mass ratio by matching a precise
ab initio calculation with the measured vibrational frequency.
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