![]() As a specialist in radio wave propagation, Brillouin was appointed Director General of the French state-run agency, Radiodiffusion Nationale about a month before war with Germany, August 1939. ![]() Since Brillouin's study with Sommerfeld, he was interested and did pioneering work in the diffraction of electromagnetic radiation in a dispersive media. Quantum mechanical perturbations techniques by Brillouin and by Eugene Wigner resulted in what is known as the Brillouin–Wigner formula. During his work on the propagation of electron waves in a crystal lattice, he introduced the concept of Brillouin zones in 1930. In 1928, after the Institut Henri Poincaré was established, he was appointed as professor to the Chair for Theoretical Physics. In 1926, Gregor Wentzel, Hendrik Kramers, and Brillouin independently developed what is known as the Wentzel–Kramers–Brillouin approximation, also known as the WKB method, classical approach, and phase integral method. In 1932, he became associate director of the physics laboratories at the Collège de France. Career Īfter receipt of his doctorate, Brillouin became the scientific secretary of the reorganized Journal de Physique et le Radium. He also studied the propagation of monochromatic light waves and their interaction with acoustic waves, i.e., scattering of light with a frequency change, which became known as Brillouin scattering. In his thesis, he proposed an equation of state based on the atomic vibrations ( phonons) that propagate through it. Brillouin's thesis jury was composed of Langevin, Marie Curie, and Jean Perrin and his thesis topic was on the quantum theory of solids. At the conclusion of the war, he returned to the University of Paris to continue his studies with Paul Langevin, and was awarded his Docteur ès science in 1920. From 1914 until 1919, during World War I, he served in the military, developing the valve amplifier with G. In 1913, he went back to France to study at the University of Paris and it was in this year that Niels Bohr submitted his first paper on the Bohr model of the hydrogen atom. Just a few months before Brillouin's arrival at LMU, Max von Laue had conducted his experiment showing X-ray diffraction in a crystal lattice. ![]() ![]() At LMU, he studied theoretical physics with Arnold Sommerfeld. From 1911 he studied under Jean Perrin until he left for the Ludwig Maximilian University of Munich (LMU), in 1912. His father, Marcel Brillouin, grandfather, Éleuthère Mascart, and great-grandfather, Charles Briot, were physicists as well.įrom 1908 to 1912, Brillouin studied physics at the École Normale Supérieure, in Paris. ![]() Brillouin was born in Sèvres, near Paris, France. ![]()
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