Physicists at Max Planck Institute of Quantum Optics (MPQ) have reinforced a measurement that runs counter to decades of accepted nuclear data: the proton is smaller than the standard value long used ...

Ultrafast spectroscopy has emerged as a powerful tool for dissecting the mechanisms and time scales of proton transfer in chemical and biological systems. By employing light pulses on the femtosecond ...

Proton transfer in aqueous systems is a fundamental process occurring constantly around us. It involves a molecule losing a proton, which then associates with another molecule. Given its significance ...

Physicists in Germany have carried out the most accurate measurement to date of the width of the proton. By examining a previously unexplored energy-level transition in the hydrogen atom, Lothar ...

Why were so many physicists so wrong about the size of the proton for so long? As Edwin Cartlidge explains, the solution to this “proton radius puzzle” has as much to do with bureaucracy and politics ...