THE SCIENTIFIC WORK OF E. K. ZAVOISKY

In 1944 Assistant Professor of Kazan State University Evgeny K. Zavoisky detected for the first time the Electron Paramagnetic Resonance absorption in paramagnetic substances. In these experiments, he used manganese and copper sulfates, and anhydrous chromium chloride. E. K. Zavoisky was inspired by Gorter's experiments on paramagnetic relaxation in solid paramagnetic salts. However, he replaced the calorimetric detection method, which was used by C. J. Gorter, by a sensitive electronic method - the method of grid current. For the success of Zavoisky's experiment it was also very important that he decided to apply a low frequency modulation of an external magnetic field.