F. Biraben
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View article: The helion charge radius from laser spectroscopy of muonic helium-3 ions
The helion charge radius from laser spectroscopy of muonic helium-3 ions Open
Hydrogen-like light muonic ions, in which one negative muon replaces all the electrons, are extremely sensitive probes of nuclear structure, because the large muon mass increases tremendously the wave function overlap with the nucleus. Usi…
View article: The first decades of Doppler-free two-photon spectroscopy
The first decades of Doppler-free two-photon spectroscopy Open
This paper gives a review of the Doppler-free two-photon experiments performed since the beginning of the 1970s until the end of the 1990s. The Doppler-free two-photon method was first tested on the sodium atom, then used extensively to st…
View article: High‐Resolution Hydrogen Spectroscopy and The Proton Radius Puzzle
High‐Resolution Hydrogen Spectroscopy and The Proton Radius Puzzle Open
High resolution spectroscopy of the hydrogen atom takes on particular importance in the new SI, as it allows to accurately determine fundamental constants, such as the Rydberg constant and the proton charge radius. Recently, the second mos…
View article: State of the art in the determination of the fine-structure constant and the ratio h/mu
State of the art in the determination of the fine-structure constant and the ratio h/mu Open
The fine structure constant α and the ratio between the Planck constant and the unified atomic mass are keystone constants for the determination of other fundamental physical constants, especially the ones involved in the framework of the…
View article: The next generation of laser spectroscopy experiments using light muonic atoms
The next generation of laser spectroscopy experiments using light muonic atoms Open
Precision spectroscopy of light muonic atoms provides unique information about the atomic and nuclear structure of these systems and thus represents a way to access fundamental interactions, properties and constants. One application compri…
View article: The next generation of laser spectroscopy experiments using light muonic atoms
The next generation of laser spectroscopy experiments using light muonic atoms Open
Precision spectroscopy of light muonic atoms provides unique information about the atomic and nuclear structure of these systems and thus represents a way to access fundamental interactions, properties and constants. One application compri…
View article: Laser Spectroscopy of Muonic Atoms and Ions
Laser Spectroscopy of Muonic Atoms and Ions Open
Laser spectroscopy of the Lamb shift (2S-2P energy difference) in light muonic atoms or ions, in which one negative muon $μ^-$ is bound to a nucleus, has been performed. The measurements yield significantly improved values of the root-mean…
View article: The proton radius puzzle
The proton radius puzzle Open
High-precision measurements of the proton radius from laser spectroscopy of muonic hydrogen demonstrated up to six standard deviations smaller values than obtained from electron-proton scattering and hydrogen spectroscopy. The status of th…
View article: Precise determination of the ratio<i>h</i>/<i>m</i><sub>u</sub>: a way to link microscopic mass to the new kilogram
Precise determination of the ratio<i>h</i>/<i>m</i><sub>u</sub>: a way to link microscopic mass to the new kilogram Open
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View article: Laser spectroscopy of muonic deuterium
Laser spectroscopy of muonic deuterium Open
The deuteron is too small, too The radius of the proton has remained a point of debate ever since the spectroscopy of muonic hydrogen indicated a large discrepancy from the previously accepted value. Pohl et al. add an important clue for s…
View article: Deuteron charge radius from spectroscopy data in atomic deuterium
Deuteron charge radius from spectroscopy data in atomic deuterium Open
We give a pedagogical description of the method to extract the charge radii and Rydberg constant from laser spectroscopy in regular hydrogen (H) and deuterium (D) atoms, that is part of the CODATA least-squares adjustment (LSA) of the fund…
View article: Experiments towards resolving the proton charge radius puzzle
Experiments towards resolving the proton charge radius puzzle Open
We review the status of the proton charge radius puzzle. Emphasis is given to the various experiments initiated to resolve the conflict between the muonic hydrogen results and the results from scattering and regular hydrogen spectroscopy.
View article: Improved x-ray detection and particle identification with avalanche photodiodes
Improved x-ray detection and particle identification with avalanche photodiodes Open
Avalanche photodiodes are commonly used as detectors for low energy x-rays. In this work, we report on a fitting technique used to account for different detector responses resulting from photoabsorption in the various avalanche photodiode …