Louis Victoire
Prince de Broglie
 Louis de Broglie
Mit Begeisterung studierte de
Broglie die Abhandlungen des 1. Solvay-Kongresse
(Brüssel Ende 1911) und entwickelte
selbstständige Überlegungen zur Quantentheorie.
Der Ausbruch des 1. Weltkrieges beendeten diesen
Ansatz. - Seit 1919 wieder physikalische tätig,
empfing de Broglie viele Anregungen von seinem um
17 Jahre älteren Bruder Maurice. Dieser
unterhielt in Paris ein Privatlaboratorium, wo
vornehmlich über Röntgenspektroskopie und
Radioaktivität gearbeitet wurde. Ende 1923
konzipierte de Broglie seine grundlegenden Ideen
über die Dualität von Welle und
Korpuskel, die am 25. November 1924 in
der berühmten Dissertation 'Recherches
sur la Theorie des Quanta' an der
Sorbonne verteidigt wurden.
http://www.chemie.uni-bremen.de/stohrer/biograph/debrog.htm
Louis Victoire Prince de Broglie Nobel
Prize Physics 1929
"for his discovery of
the wave nature of electrons"
http://www.nobel.se/laureates/physics-1929.html
Biography of L-V. de Broglie
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 andposted
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.
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.
http://www.at.nobel.se/laureates/physics-1929-1-bio.html
Prince Louis de Broglie
In 1923, as part of his Ph. D.
Thesis, Louis de Broglie (he was of the French
aristocracy - hence the title "Prince")
argued that since light could be seen to behave
under some conditions as particles (photoelectric
effect) and other times as waves (diffraction),
we can also consider that matter has the same
ambiguity of possessing both particle and wave
properties. He suggested that the quantization
observed everywhere experimentally and asserted
in an ad hoc fashion in Bohr's theory
arose from this wave property of matter. We know
that a guitar string can flop around in any old
way when left sitting on the table. But when we
tie down its two ends and apply a specific
tension, it vibrates with only certain specific
frequencies - a fundamental and overtones of that
fundamental. By confining the string, its wave
properties become quantized and only a select few
frequencies are ever observed for the vibration
of that string. We can change sounds by changing
the confinement - pressing on a fret in order to
make the string effectively shorter - or by
changing the tension. But once its confinement
conditions are specified, it has a very specific
set of vibrations from which it can choose once
stimulated by its being plucked. de Broglie
suggested that when an electron is confined in an
atom, its wave properties are quantized also.
http://www.chembio.uoguelph.ca/educmat/chm386/rudiment/tourquan/broglie.htm
 Wave Mechanics; Prince Louis de Broglie
In 1923, while still a graduate
student at the University of Paris, Louis de
Broglie published a brief note in the journal Comptes
rendus containing an idea that was to
revolutionize our understanding of the physical
world at the most fundamental level.
http://www.davis-inc.com/physics/index.shtml
de Broglie Waves
www-admin@theory.uwinnipeg.ca
In 1924 a young physicist, de Broglie, speculated
that nature did not single out light as being the only matter which
exhibits a wave-particle duality. He proposed that ordinary "particles''
such as electrons, protons, or bowling balls could also exhibit
wave characteristics in certain circumstances. Quantitatively, he
associated a wavelength  to a particle
of mass m moving at speed v :
= 
Tests
of this hypothesis would involve demonstrating
wave properties of matter at the wavelength given
by the Equation above. Relatively straightforward
tests are offered by diffraction and interference
- if a beam of such "particles'' were shone
at a diffraction grating and a diffraction
pattern of a series of light and dark fringes
results, then one would be forced to adopt the
wave picture for this phenomena. Thus, it is
possible to verify the wave nature of electrons
in such diffraction experiments, and indeed this
property is the principle behind the relatively
common electron microscope. Therefore, Nature
seems to be symmetric, in that light and ordinary
``particles'' exhibits this wave-particle
duality.
http://theory.uwinnipeg.ca/physics/quant/node6.html
BROGLIE, Louis Victor, Prince de
BROGLIE, Louis Victor, Prince de
(1892-1987), French physicist and Nobel laureate,
who made major contributions to the theory of
quantum mechanics with his studies of electromagnetic
radiation . For his
discovery (1924) of the wave nature of electrons,
he was awarded the 1929 Nobel Prize in physics.
http://www.fwkc.com/encyclopedia/low/articles/b/b003002663f.html
Louis Victor Pierre Raymond duc de
Broglie
Born: 15 Aug 1892 in Dieppe,
France Died: 19 March 1987 in Paris, France
De Broglie was best known for his
particle-wave duality theory that matter has the
properties of both particles and waves. His
doctoral thesis of 1924 put forward this theory
of electron waves, based on the work of Einstein and Planck. The wave
nature of the electron was experimentally
confirmed in 1927 by C J Davisson, C H Kunsman
and L H Germer in the U.S.A. and by G P Thomson
in Scotland.
http://www-history.mcs.st-andrews.ac.uk/history/Mathematicians/Broglie.html
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