Ludwig Waldmann (1913-1980). In 1943 he became a member of the Kaiser Wihelm Institute for Chemistry in Berlin. When the Institute moved, he moved with it; first to Tailfingen and then to Mainz. Waldmann received an appointment as a Scientific Fellow at the Max Planck Institute for Chemistry in 1954. In 1963 he accepted a position as professor at the University of Erlangen-Nürnberg and left Mainz, but he remained an External Scientific Member of the MPIC.
Waldmann’s research focused on questions about theoretical physics and he made a number of theoretical and experimental contributions to gas kinetics. He investigated the thermal diffusion effect and the concomitant pressure and temperature dependence as well as the relationships of Onsager symmetry. In 1957 he extended the so-called Boltzmann equation to apply it to gases with rotating molecules (Waldmann-Snider equation) and developed a theory of diffusion. In addition, he explored the physical properties of a Lorentz's rigid electron.
In 1961 it was his idea that instigated the investigation of various gas-kinetic behaviors of hydrogen molecules of the same mass, such as D2. In collaboration with Josef Mattauch and his research group, Waldmann developed a new method of mass spectral dispersion determination which made possible a very exact evaluation of mass spectra.