Igor Yevgenyevich Tamm was a Soviet physicist who received the 1958 Nobel Prize in Physics, jointly with Pavel Alekseyevich Cherenkov and Ilya Mikhailovich Frank, for their 1934 discovery and demonstration of Cherenkov radiation. He also predicted the quasi-particle of sound: the phonon; and in 1951, together with Andrei Sakharov, proposed the Tokamak system.
Tamm in 1958
Tamm on the 2000 Russian stamp "Idea of phonons, 1929"
Pavel Alekseyevich Cherenkov was a Soviet physicist who shared the Nobel Prize in physics in 1958 with Ilya Frank and Igor Tamm for the discovery of Cherenkov radiation, made in 1934.
Cherenkov in 1958
Cherenkov radiation is named for his discovery of the phenomenon; pictured here glowing is the core of the Advanced Test Reactor.