**Prince Louis-Victor de Broglie** of the French Academy, Permanent
Secretary of the Academy of Sciences, and Professor at the Faculty of
Sciences at Paris University, was born at Dieppe (Seine Inférieure)
on 15th August, 1892, the son of Victor, Duc de Broglie and Pauline d'Armaillé.
After studying at the Lycée Janson of Sailly, he passed his school-leaving
certificate in 1909. He applied himself first to literary studies and
took his degree in history in 1910. Then, as his liking for science prevailed,
he studied for a science degree, which he gained in 1913. He was then
conscripted for military service and posted to the wireless section of
the army, where he remained for the whole of the war of 1914-1918. During
this period he was stationed at the Eiffel Tower, where he devoted his
spare time to the study of technical problems. At the end of the war Louis
de Broglie resumed his studies of general physics. While taking an interest
in the experimental work carried out by his elder brother, Maurice, and
co-workers, he specialized in theoretical physics and, in particular,
in the study of problems involving quanta. In 1924 at the Faculty of Sciences
at Paris University he delivered a thesis *Recherches sur la Théorie
des Quanta* (Researches on the quantum theory), which gained him his
doctor's degree. This thesis contained a series of important findings
which he had obtained in the course of about two years. The ideas set
out in that work, which first gave rise to astonishment owing to their
novelty, were subsequently fully confirmed by the discovery of electron
diffraction by crystals in 1927 by Davisson and Germer; they served as
the basis for developing the general theory nowadays known by the name
of *wave mechanics*, a theory which has utterly transformed our knowledge
of physical phenomena on the atomic scale.

After the maintaining of his thesis and while continuing to
publish original work on the new mechanics, Louis de Broglie took
up teaching duties. On completion of two year's free lectures at
the Sorbonne he was appointed to teach theoretical physics at the
Institut Henri Poincaré which had just been built in Paris.
The purpose of that Institute is to teach and develop
mathematical and theoretical physics. The incumbent of the chair
of theoretical physics at the Faculty of Sciences at the
University of Paris since 1932, Louis de Broglie runs a course on
a different subject each year at the Institut Henri
Poincaré, and several of these courses have been published.
Many French and foreign students have come to work with him and a
great deal of doctorate theses have been prepared under his
guidance.

Between 1930 and 1950, Louis de Broglie's work has been chiefly
devoted to the study of the various extensions of wave mechanics:
Dirac's electron theory, the new theory of light, the general
theory of spin particles, applications of wave mechanics to
nuclear physics, etc. He has published numerous notes and several
papers on this subject, and is the author of more than
twenty-five books on the fields of his particular
interests.

Since 1951, together with young colleagues, Louis de Broglie has resumed
the study of an attempt which he made in 1927 under the name of the *theory
of the double solution* to give a causal interpretation to wave mechanics
in the classical terms of space and time, an attempt which he had then
abandoned in the face of the almost universal adherence of physicists
to the purely probabilistic interpretation of Born, Bohr, and Heisenberg.
Back again in this his former field of research, he has obtained a certain
number of new and encouraging results which he has published in notes
to *Comptes Rendus de l'Académie des Sciences* and in various
expositions.

After crowning Louis de Broglie's work on two occasions, the Academie
des Sciences awarded him in 1929 the Henri Poincaré medal (awarded
for the first time), then in 1932, the Albert I of Monaco prize. In 1929
the Swedish Academy of Sciences conferred on him the Nobel Prize for Physics
"for his discovery of the wave nature of electrons". In 1952 the first
Kalinga Prize was awarded to him by UNESCO for his efforts to explain
aspects of modern physics to the layman. In 1956 he received the gold
medal of the French National Scientific Research Centre. He has made major
contributions to the fostering of international scientific co-operation.

Elected a member of the Academy of Sciences of the French
Institute in 1933, Louis de Broglie has been its Permanent
Secretary for the mathematical sciences since 1942. He has been a
member of the Bureau des Longitudes since 1944. He holds the
Grand Cross of the Légion d'Honneur and is an Officer of the
Order of Leopold of Belgium. He is an honorary doctor of the
Universities of
Warsaw, Bucharest, Athens, Lausanne, Quebec, and Brussels, and a member of eighteen foreign academies
in Europe, India, and the U.S.A.

Professor de Broglie's most important publications are:

*Recherches sur la théorie des quanta* (Researches on
the quantum theory), Thesis Paris, 1924.

*Ondes et mouvements* (Waves and motions), Gauthier-Villars,
Paris, 1926.

*Rapport au 5e Conseil de Physique Solvay*, Brussels,
1927.

*La mécanique ondulatoire* (Wave mechanics),
Gauthier-Villars, Paris, 1928.

*Une tentative d'interprétation causale et non
linéaire de la mécanique ondulatoire: la théorie
de la double solution*, Gauthier-Villars, Paris, 1956.

English translation: *Non-linear Wave Mechanics: A Causal
Interpretation*, Elsevier, Amsterdam, 1960.

*Introduction à la nouvelle théorie des particules de
M. Jean-Pierre Vigier et de ses collaborateurs*,
Gauthier-Villars, Paris, 1961.

English translation: *Introduction to the Vigier Theory of
elementary particles*, Elsevier, Amsterdam, 1963.

*Étude critique des bases de l'interprétation
actuelle de la mécanique ondulatoire*, Gauthier-Villars,
Paris, 1963.

English translation: *The Current Interpretation of Wave
Mechanics: A Critical Study*, Elsevier, Amsterdam, 1964.

From Nobel Lectures, Physics 1922-1941, Elsevier Publishing Company, Amsterdam, 1965

This autobiography/biography was first published in
the book series *Les Prix Nobel*. It was later edited and republished
in *obel Lectures*. To cite this document, always state the source
as shown above.

*Louis de Broglie died on March 19, 1987.*

Copyright © The Nobel Foundation 1929

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