Thomas Udem is a professor at LMU Munich and one of the longest-serving members of the laser spectroscopy research group led by Nobel prize winner Theodor Hänsch.

Physicists at the Max Planck Institute of Quantum Optics have tested quantum mechanics to a completely new level of precision using hydrogen spectroscopy, and in doing so they came much closer to solving the well-known proton charge radius puzzle.

The size of the alpha particle, the nucleus of the helium atom, has been measured more accurately than ever before. Results now indicate a size 1.67824(83) femtometers, which is 4.8 times more precise than previous measurements.

Our eyes are sensitive to only three spectral color bands (red, green, blue), and we all know that we can no longer distinguish colors if it becomes very dark. Spectroscopists can identify many more colors by the frequencies of the light waves, so that they can distinguish atoms and molecules by their spectral fingerprints.

The DPG awards Nathalie Picqué with the 2021 Gentner-Kastler Prize for outstanding contributions to high-resolution broad-field molecular spectroscopy with frequency combs.

Alexey successfully defended his PhD thesis