Upcoming and planned experiments combining increasingly intense lasers and energetic
particle beams will access new regimes of nonlinear, relativistic, quantum effects. This …

This article reviews recent developments in tests of fundamental physics using atoms and
molecules, including the subjects of parity violation, searches for permanent electric dipole …

Recent developments in frequency metrology and optical clocks have been based on
electronic transitions in atoms and singly charged ions as references. The control over all …

Quantum electrodynamics (QED) is one of the most fundamental theories of physics and has
been shown to be in excellent agreement with experimental results,,,–. In particular …

Precision spectroscopy of atomic systems is an invaluable tool for the study of fundamental
interactions and symmetries. Recently, highly charged ions have been proposed to enable …

This paper gives the 1998 self-consistent set of values of the basic constants and conversion
factors of physics and chemistry recommended by the Committee on Data for Science and …

Inner-shell electrons naturally sense the electric field close to the nucleus, which can reach
extreme values beyond 1015 V cm− 1 for the innermost electrons. Especially in few-electron …

The quest for the value of the electron's atomic mass has been the subject of continuing
efforts over the past few decades,,,. Among the seemingly fundamental constants that …

1.1. Background This article reports work carried out under the auspices of the Committee
on Data for Science and Technology (CODATA) Task Group on Fundamental Constants. 1 It …

We report on the precise measurement of the atomic mass of a single proton with a purpose-
built Penning-trap system. With a precision of 32 parts per trillion our result not only …