Walter Heitler
Encyclopedia
Walter Heinrich Heitler (2 January 1904 – 15 November 1981) was a German physicist
Physicist
A physicist is a scientist who studies or practices physics. Physicists study a wide range of physical phenomena in many branches of physics spanning all length scales: from sub-atomic particles of which all ordinary matter is made to the behavior of the material Universe as a whole...

 who made contributions to quantum electrodynamics
Quantum electrodynamics
Quantum electrodynamics is the relativistic quantum field theory of electrodynamics. In essence, it describes how light and matter interact and is the first theory where full agreement between quantum mechanics and special relativity is achieved...

 and quantum field theory
Quantum field theory
Quantum field theory provides a theoretical framework for constructing quantum mechanical models of systems classically parametrized by an infinite number of dynamical degrees of freedom, that is, fields and many-body systems. It is the natural and quantitative language of particle physics and...

. He brought chemistry under quantum mechanics
Quantum mechanics
Quantum mechanics, also known as quantum physics or quantum theory, is a branch of physics providing a mathematical description of much of the dual particle-like and wave-like behavior and interactions of energy and matter. It departs from classical mechanics primarily at the atomic and subatomic...

 through his theory of valence bonding
Valence bond theory
In chemistry, valence bond theory is one of two basic theories, along with molecular orbital theory, that were developed to use the methods of quantum mechanics to explain chemical bonding. It focuses on how the atomic orbitals of the dissociated atoms combine to give individual chemical bonds...

.

Education

In 1922, Heitler began his study of physics
Physics
Physics is a natural science that involves the study of matter and its motion through spacetime, along with related concepts such as energy and force. More broadly, it is the general analysis of nature, conducted in order to understand how the universe behaves.Physics is one of the oldest academic...

 at the Karlsruhe
Karlsruhe
The City of Karlsruhe is a city in the southwest of Germany, in the state of Baden-Württemberg, located near the French-German border.Karlsruhe was founded in 1715 as Karlsruhe Palace, when Germany was a series of principalities and city states...

 Technische Hochschule
Technische Hochschule
Technische Hochschule is what an Institute of Technology used to be called in German-speaking countries, as well as in the Netherlands, before most of them changed their name to Technische Universität or Technische Universiteit in the 1970s and in the...

, in 1923 at the Humboldt University of Berlin
Humboldt University of Berlin
The Humboldt University of Berlin is Berlin's oldest university, founded in 1810 as the University of Berlin by the liberal Prussian educational reformer and linguist Wilhelm von Humboldt, whose university model has strongly influenced other European and Western universities...

, and in 1924 at the Ludwig Maximilians University of Munich
Ludwig Maximilians University of Munich
The Ludwig Maximilian University of Munich , commonly known as the University of Munich or LMU, is a university in Munich, Germany...

 (LMU), where he studied under both Arnold Sommerfeld
Arnold Sommerfeld
Arnold Johannes Wilhelm Sommerfeld was a German theoretical physicist who pioneered developments in atomic and quantum physics, and also educated and groomed a large number of students for the new era of theoretical physics...

 and Karl Herzfeld
Karl Herzfeld
Karl Ferdinand Herzfeld was an Austrian-American physicist.-Education:...

. The latter was his thesis advisor when he obtained his doctorate in 1926; Herzfeld taught courses in theoretical physics and one in physical chemistry, and in Sommerfeld’s absence often took over his classes. From 1926 to 1927, he was a Rockefeller Foundation
Rockefeller Foundation
The Rockefeller Foundation is a prominent philanthropic organization and private foundation based at 420 Fifth Avenue, New York City. The preeminent institution established by the six-generation Rockefeller family, it was founded by John D. Rockefeller , along with his son John D. Rockefeller, Jr...

 Fellow for postgraduate research with N. E. J. Bjerrum-Bohr at the Institute for Theoretical Physics at the University of Copenhagen
University of Copenhagen
The University of Copenhagen is the oldest and largest university and research institution in Denmark. Founded in 1479, it has more than 37,000 students, the majority of whom are female , and more than 7,000 employees. The university has several campuses located in and around Copenhagen, with the...

 and with Erwin Schrödinger
Erwin Schrödinger
Erwin Rudolf Josef Alexander Schrödinger was an Austrian physicist and theoretical biologist who was one of the fathers of quantum mechanics, and is famed for a number of important contributions to physics, especially the Schrödinger equation, for which he received the Nobel Prize in Physics in 1933...

 at the University of Zurich
University of Zurich
The University of Zurich , located in the city of Zurich, is the largest university in Switzerland, with over 25,000 students. It was founded in 1833 from the existing colleges of theology, law, medicine and a new faculty of philosophy....

. He then became an assistant to Max Born
Max Born
Max Born was a German-born physicist and mathematician who was instrumental in the development of quantum mechanics. He also made contributions to solid-state physics and optics and supervised the work of a number of notable physicists in the 1920s and 30s...

 at the Institute for Theoretical Physics at the Georg-August University of Göttingen
Georg-August University of Göttingen
The University of Göttingen , known informally as Georgia Augusta, is a university in the city of Göttingen, Germany.Founded in 1734 by King George II of Great Britain and the Elector of Hanover, it opened for classes in 1737. The University of Göttingen soon grew in size and popularity...

. Heilter completed his Habilitation
Habilitation
Habilitation is the highest academic qualification a scholar can achieve by his or her own pursuit in several European and Asian countries. Earned after obtaining a research doctorate, such as a PhD, habilitation requires the candidate to write a professorial thesis based on independent...

, under Born, in 1929, and then remained as a Privatdozent
Privatdozent
Privatdozent or Private lecturer is a title conferred in some European university systems, especially in German-speaking countries, for someone who pursues an academic career and holds all formal qualifications to become a tenured university professor...

 until 1933.

At the time Heitler received his doctorate, three Institutes for Theoretical Physics formed a consortium which worked on the key problems of the day, such as atomic and molecular structure, and exchanged both scientific information and personnel in their scientific quests. These institutes were located at the LMU, under Arnold Sommerfeld
Arnold Sommerfeld
Arnold Johannes Wilhelm Sommerfeld was a German theoretical physicist who pioneered developments in atomic and quantum physics, and also educated and groomed a large number of students for the new era of theoretical physics...

, the University of Göttingen, under Max Born
Max Born
Max Born was a German-born physicist and mathematician who was instrumental in the development of quantum mechanics. He also made contributions to solid-state physics and optics and supervised the work of a number of notable physicists in the 1920s and 30s...

, and the University of Copenhagen
University of Copenhagen
The University of Copenhagen is the oldest and largest university and research institution in Denmark. Founded in 1479, it has more than 37,000 students, the majority of whom are female , and more than 7,000 employees. The university has several campuses located in and around Copenhagen, with the...

, under Niels Bohr
Niels Bohr
Niels Henrik David Bohr was a Danish physicist who made foundational contributions to understanding atomic structure and quantum mechanics, for which he received the Nobel Prize in Physics in 1922. Bohr mentored and collaborated with many of the top physicists of the century at his institute in...

. Furthermore, Werner Heisenberg
Werner Heisenberg
Werner Karl Heisenberg was a German theoretical physicist who made foundational contributions to quantum mechanics and is best known for asserting the uncertainty principle of quantum theory...

 and Born had just recently published their trilogy of papers which launched the matrix mechanics
Matrix mechanics
Matrix mechanics is a formulation of quantum mechanics created by Werner Heisenberg, Max Born, and Pascual Jordan in 1925.Matrix mechanics was the first conceptually autonomous and logically consistent formulation of quantum mechanics. It extended the Bohr Model by describing how the quantum jumps...

 formulation of quantum mechanics
Quantum mechanics
Quantum mechanics, also known as quantum physics or quantum theory, is a branch of physics providing a mathematical description of much of the dual particle-like and wave-like behavior and interactions of energy and matter. It departs from classical mechanics primarily at the atomic and subatomic...

. Also, in early 1926, Erwin Schrödinger, at the University of Zurich
University of Zurich
The University of Zurich , located in the city of Zurich, is the largest university in Switzerland, with over 25,000 students. It was founded in 1833 from the existing colleges of theology, law, medicine and a new faculty of philosophy....

, began to publish his quintet of papers which launched the wave mechanics formulation of quantum mechanics and showed that the wave mechanics and matrix mechanics formulations were equivalent. These papers immediately put the personnel at the leading theoretical physics institutes onto applying these new tools to understanding atomic and molecular structure. It was in this environment that Heitler went on his Rockefeller Foundations Fellowship, leaving LMU and within a period of two years going to do research and study with the leading figures of the day in theoretical physics, Bohr’s personnel in Copenhagen, Schrödinger in Zurich, and Born in Göttingen.

In Zurich, with Fritz London
Fritz London
Fritz Wolfgang London was a German theoretical physicist. His fundamental contributions to the theories of chemical bonding and of intermolecular forces are today considered classic and are discussed in standard textbooks of physical chemistry.With his brother Heinz, he made a significant...

, Heitler applied the new quantum mechanics to deal with the saturable, nondynamic forces of attraction and repulsion, i.e., exchange forces, of the hydrogen molecule. Their valence bond
Valence bond theory
In chemistry, valence bond theory is one of two basic theories, along with molecular orbital theory, that were developed to use the methods of quantum mechanics to explain chemical bonding. It focuses on how the atomic orbitals of the dissociated atoms combine to give individual chemical bonds...

 treatment of this problem, was a landmark in that it brought chemistry under quantum mechanics. Furthermore, their work greatly influenced chemistry through Linus Pauling
Linus Pauling
Linus Carl Pauling was an American chemist, biochemist, peace activist, author, and educator. He was one of the most influential chemists in history and ranks among the most important scientists of the 20th century...

, who had just received his doctorate and on a Guggenheim Fellowship
Guggenheim Fellowship
Guggenheim Fellowships are American grants that have been awarded annually since 1925 by the John Simon Guggenheim Memorial Foundation to those "who have demonstrated exceptional capacity for productive scholarship or exceptional creative ability in the arts." Each year, the foundation makes...

 visited Heitler and London in Zurich, as Pauling spent much of his career studying the nature of the chemical bond. The application of quantum mechanics to chemistry would be a prominent theme in Heitler’s career.

While Heitler was at Göttingen, Adolf Hitler
Adolf Hitler
Adolf Hitler was an Austrian-born German politician and the leader of the National Socialist German Workers Party , commonly referred to as the Nazi Party). He was Chancellor of Germany from 1933 to 1945, and head of state from 1934 to 1945...

 came to power in 1933. With the rising prominence of anti-Semitism under Hitler, Born took it upon himself to take the younger Jewish generation under his wing. In doing so, Born arranged for Heitler to get a position that year as a Research Fellow at the University of Bristol
University of Bristol
The University of Bristol is a public research university located in Bristol, United Kingdom. One of the so-called "red brick" universities, it received its Royal Charter in 1909, although its predecessor institution, University College, Bristol, had been in existence since 1876.The University is...

, with Nevill Francis Mott
Nevill Francis Mott
Sir Nevill Francis Mott, CH, FRS was an English physicist. He won the Nobel Prize for Physics in 1977 for his work on the electronic structure of magnetic and disordered systems, especially amorphous semiconductors. The award was shared with Philip W. Anderson and J. H...

.

Career

At Bristol, Heitler was a Research Fellow of the Academic Assistance Council, in the H. H. Wills Physics Laboratory. At Bristol, among other things, he worked on quantum field theory
Quantum field theory
Quantum field theory provides a theoretical framework for constructing quantum mechanical models of systems classically parametrized by an infinite number of dynamical degrees of freedom, that is, fields and many-body systems. It is the natural and quantitative language of particle physics and...

 and quantum electrodynamics
Quantum electrodynamics
Quantum electrodynamics is the relativistic quantum field theory of electrodynamics. In essence, it describes how light and matter interact and is the first theory where full agreement between quantum mechanics and special relativity is achieved...

 on his own, as well as in collaboration with other scientific refugees from Hitler, such as Hans Bethe
Hans Bethe
Hans Albrecht Bethe was a German-American nuclear physicist, and Nobel laureate in physics for his work on the theory of stellar nucleosynthesis. A versatile theoretical physicist, Bethe also made important contributions to quantum electrodynamics, nuclear physics, solid-state physics and...

 and Herbert Fröhlich
Herbert Fröhlich
Herbert Fröhlich was a German-born British physicist and a Fellow of the Royal Society....

, who also left Germany in 1933.

With Bethe, he published a paper on pair production of gamma rays in the Coulomb field of an atomic nucleus, in which they developed the Bethe-Heitler formula for Bremsstrahlung
Bremsstrahlung
Bremsstrahlung is electromagnetic radiation produced by the deceleration of a charged particle when deflected by another charged particle, typically an electron by an atomic nucleus. The moving particle loses kinetic energy, which is converted into a photon because energy is conserved. The term is...

.

Heitler also contributed to the understanding of cosmic rays,
as well as predicted the existence of the electrically neutral pi meson.

In 1936, Heitler published his major work on quantum electrodynamics, The Quantum Theory of Radiation, which marked the direction for future developments in quantum theory. The book appeared in many editions and printings, even being translated in Russian.

After the fall of France in 1940, Heitler was briefly interned on the Isle of Man
Isle of Man
The Isle of Man , otherwise known simply as Mann , is a self-governing British Crown Dependency, located in the Irish Sea between the islands of Great Britain and Ireland, within the British Isles. The head of state is Queen Elizabeth II, who holds the title of Lord of Mann. The Lord of Mann is...

 for several months.

Heitler remained at Bristol eight years, until 1941, when he became a professor at the Dublin Institute for Advanced Studies
Dublin Institute for Advanced Studies
The Dublin Institute for Advanced Studies Dublin, Ireland was established in 1940 by the Taoiseach of the time, Éamon de Valera under the . The Institute consists of 3 schools: The , the and the . The directors of these schools are currently Professor Werner Nahm, Professor Luke Drury and...

, which was arranged there by Erwin Schrödinger, Director of the School for Theoretical Physics.

At Dublin, Heitler’s work with H. W. Peng
Peng Huanwu
Peng Huanwu was a renowned theoretical physicist of China, a member of Chinese Academy of Sciences , and a leader of Chinese nuclear weaponry projects....

 on radiation damping theory and the meson scattering process resulted in the Heitler-Peng integral equation.

During the 1942-1943 academic year, Heitler gave a course on elementary wave mechanics, during which W. S. E. Hickson took notes and prepared a finished copy. These notes were the basis for Heitler’s book Elementary Wave Mechanics: Introductory Course of Lectures, first published in 1943. A new edition was published as Elementary Wave Mechanics in 1945. This version was revised and republished many times, as well as being translated into French and Italian and published in 1949 and in German in 1961. A further revised version appeared as Elementary Wave Mechanics With Applications to Quantum Chemistry in 1956, as well as in German in 1961.

Schrödinger resigned as Director of the School for Theoretical Physics in 1946, but stayed at Dublin, whereupon Heitler became Director. Heitler stayed at Dublin until 1949, when he accepted a position as Ordinarius Professor for Theoretical Physics and Director of the Institute for Theoretical Physics at the University of Zurich
University of Zurich
The University of Zurich , located in the city of Zurich, is the largest university in Switzerland, with over 25,000 students. It was founded in 1833 from the existing colleges of theology, law, medicine and a new faculty of philosophy....

, where he remained until 1974.

In 1958, Heitler held the Lorentz Chair for Theoretical Physics at the University of Leiden.

While in Zurich, after some years, he began writing on the philosophical relationship of science to religion. His books were published in German, English, and French.

Honors

  • 1943 – Fellow of the Royal Irish Academy
    Royal Irish Academy
    The Royal Irish Academy , based in Dublin, is an all-Ireland, independent, academic body that promotes study and excellence in the sciences, humanities and social sciences. It is one of Ireland's premier learned societies and cultural institutions and currently has around 420 Members, elected in...


  • 1948 – Fellow of the Royal Society
    Royal Society
    The Royal Society of London for Improving Natural Knowledge, known simply as the Royal Society, is a learned society for science, and is possibly the oldest such society in existence. Founded in November 1660, it was granted a Royal Charter by King Charles II as the "Royal Society of London"...

     of London

  • 1968 – Deutsche Physikalische Gesellschaft
    Deutsche Physikalische Gesellschaft
    The Deutsche Physikalische Gesellschaft is the world's largest organization of physicists. The DPG's worldwide membership is cited as 60,000, as of 2011...

     Max-Planck Medal

  • 1969 – Marcel Benoist Prize
    Marcel Benoist Prize
    The Marcel Benoist Prize, offered by the Marcel Benoist Foundation, is a monetary prize that has been offered annually since 1920 to a scientist of Swiss nationality or residency who has made the most useful scientific discovery. Emphasis is placed on those discoveries affecting human life...


  • 1979 – Gold Medal of the Humboldt Gesellschaft

Physics

  • Walter Heitler Elementary Wave Mechanics: Introductory Course of Lectures Notes taken and prepared by W.S.E. Hickson (Oxford, 1943)

  • Walter Heitler Elementary Wave Mechanics (Oxford, 1945, 1946, 1948, 1950)

  • Walter Heitler The Quantum Theory of Radiation (Clarendon Press, 1936, 1944, 1947, 1949, 1950, 1953, 1954, 1957, 1960, 1966, 1970)
    • Walter Heitler The Quantum Theory of Radiation (Dover, 1984)

  • Walter Heinrich Heitler 14 Offprints: 1928-1947 (1947)

  • Walter Heitler Eléments de Mécanique Ondulatoire (Presses Universitaires de France, PUF, Paris, 1949, 1964)

  • Walter Heitler Elementi di Meccanica Ondulatoria con presentazione di R.Ciusa (Zuffi, Bologna,1949)

  • Walter Heitler Elementary Wave Mechanics With Applications to Quantum Chemistry (Oxford University, 1956, 1958, 1961, 1969)

  • Walter Heitler “The Quantum Theory of Radiation [Russian Translation]“ (Moscow, 1956)

  • Walter Heitler Lectures on Problems Connected with the Finite Size of Elementary Particles (Tata Institute of Fundamental Research. Lectures on mathematics and physics. Physics) (Tata Institute of Fundamental Research, 1961)

  • Walter Heitler and Klaus Müller Elementare Wellenmechanik (Vieweg, 1961)

  • Walter Heitler Elementare Wellenmechanik. Mit Anwendung auf die Quantenchemie. (Vieweg Friedr. & Sohn Ver, 1961)

  • Walter Heitler Wahrheit und Richtigkeit in den exakten Wissenschaften. Abhandlungen der mathematisch- naturwissenschaftlichen Klasse. Jahrgang 1972. Nr. 3. (Akademie der Wissenschaften und der Literatur. Mainz, Verlag der Akademie der Wissenschaften und der Literatur, Kommission bei Franz Steiner Verlag, Wiesbaden, 1972)

  • Walter Heitler Über die Komplementarität von lebloser und lebender Materie. Abhandlungen der Mathematisch-Naturwissenschaftlichen Klasse, Jahrg. 1976, Nr. 1 (Mainz, Verlag der Akademie der Wissenschaften und der Literatur, Kommission bei F. Steiner, 1976)

Science and Religion

  • Walter Heitler Der Mensch und die naturwissenschaftliche Erkenntnis (Vieweg Friedr. & Sohn Ver, 1961, 1962, 1964, 1966, 1984)

  • Walter Heitler Man and Science (Oliver and Boyd, 1963)

  • Walter Heitler Die Frage nach dem Sinn der Evolution (Herder, 1969)

  • Walter Heitler Naturphilosophische Streifzüge (Vieweg Friedr. & Sohn Ver, 1970, 1984)

  • W. Heitler Naturwissenschaft ist Geisteswissenschaft (Zürich : Verl. die Waage, 1972)

  • K. Rahner, H.R. Schlette, B. Welte, R. Affemann, D. Savramis, W. Heitler Gott in dieser Zeit (C. H. Beck, 1972) ISBN 340602484X

  • Walter Heitler Die Natur und das Göttliche (Klett & Balmer; 1. Aufl edition, 1974) ISBN 978-3720690010

  • Walter Heitler Gottesbeweise? Und weitere Vorträge (1977) ISBN 978-3264901009

  • Walter Heitler La Nature et Le Divin (A la Baconniere, 1977)

  • Walter Heitler Schöpfung, die Öffnung der Naturwissenschaft zum Göttlichen (Verlag der Arche, 1979) ISBN 978-3716016633

  • Walter Heitler Schöpfung als Gottesbeweis. Die Öffnung der Naturwissenschaft zum Göttlichen (1979)
The source of this article is wikipedia, the free encyclopedia.  The text of this article is licensed under the GFDL.
 
x
OK