Leonard Ornstein
Encyclopedia
Leonard Salomon Ornstein (November 12, 1880, Nijmegen, The Netherlands — May 20, 1941, Utrecht
, The Netherlands) was a Dutch
physicist
. He studied theoretical physics with Hendrik Antoon Lorentz
at University of Leiden. He subsequently carried out Ph.D. research under the supervision of Lorentz
, concerning an application of the statistical mechanics
of Gibbs
to molecular problems. In 1914 he was appointed professor of physics, as successor of Peter Debye
, at University of Utrecht. In 1922 he became director of Physical Laboratory (Fysisch Laboratorium) and extended his research interests to experimental subjects. His measurements concerning intensities of spectral lines brought Physical Laboratory in the international limelight. He is also remembered for the Ornstein-Zernike theory (named after Ornstein and Frederik Zernike) concerning correlation functions. Together with Gilles Holst, director of Philips Research Laboratories
(Philips Natuurkundig Laboratorium), he was the driving force behind establishing the Dutch Physical Society (Nederlands Natuurkundig Vereniging, NNV) in 1921. From 1939 until November 1940 he was Chairman of this Society. From 1918 until 1922 Ornstein was Chairman of the Dutch Zionist Society (Nederlandse Zionistische Vereniging). Immediately after the involvement of the Netherlands in the World War II
(see Battle of the Netherlands
), a friend from the United States of America
, the astronomer
Peter van de Kamp
, offered to bring Ornstein and his family to America. However, Ornstein did not accept this offer, since, as he put it, he would not leave his laboratory in Utrecht. Owing to his Jewish heritage, Ornstein was summarily dismissed from University in September 1940; he was even barred from entering his own laboratory. In November 1940, he was officially dismissed from University. On his own initiative, on November 29, 1940, Ornstein withdrew his membership of the Dutch Physical Society. During this period he increasingly distanced himself from public life, to the degree that he no longer wished to receive guests at home. Ornstein died on May 20, 1941, six months after being barred from University.
One of the five buildings of Department of Physics of University of Utrecht, Ornstein Laboratorium, is named in his honor.
Utrecht (city)
Utrecht city and municipality is the capital and most populous city of the Dutch province of Utrecht. It is located in the eastern corner of the Randstad conurbation, and is the fourth largest city of the Netherlands with a population of 312,634 on 1 Jan 2011.Utrecht's ancient city centre features...
, The Netherlands) was a Dutch
Netherlands
The Netherlands is a constituent country of the Kingdom of the Netherlands, located mainly in North-West Europe and with several islands in the Caribbean. Mainland Netherlands borders the North Sea to the north and west, Belgium to the south, and Germany to the east, and shares maritime borders...
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...
. He studied theoretical physics with Hendrik Antoon Lorentz
Hendrik Lorentz
Hendrik Antoon Lorentz was a Dutch physicist who shared the 1902 Nobel Prize in Physics with Pieter Zeeman for the discovery and theoretical explanation of the Zeeman effect...
at University of Leiden. He subsequently carried out Ph.D. research under the supervision of Lorentz
Hendrik Lorentz
Hendrik Antoon Lorentz was a Dutch physicist who shared the 1902 Nobel Prize in Physics with Pieter Zeeman for the discovery and theoretical explanation of the Zeeman effect...
, concerning an application of the statistical mechanics
Statistical mechanics
Statistical mechanics or statistical thermodynamicsThe terms statistical mechanics and statistical thermodynamics are used interchangeably...
of Gibbs
Josiah Willard Gibbs
Josiah Willard Gibbs was an American theoretical physicist, chemist, and mathematician. He devised much of the theoretical foundation for chemical thermodynamics as well as physical chemistry. As a mathematician, he invented vector analysis . Yale University awarded Gibbs the first American Ph.D...
to molecular problems. In 1914 he was appointed professor of physics, as successor of Peter Debye
Peter Debye
Peter Joseph William Debye FRS was a Dutch physicist and physical chemist, and Nobel laureate in Chemistry.-Early life:...
, at University of Utrecht. In 1922 he became director of Physical Laboratory (Fysisch Laboratorium) and extended his research interests to experimental subjects. His measurements concerning intensities of spectral lines brought Physical Laboratory in the international limelight. He is also remembered for the Ornstein-Zernike theory (named after Ornstein and Frederik Zernike) concerning correlation functions. Together with Gilles Holst, director of Philips Research Laboratories
Philips
Koninklijke Philips Electronics N.V. , more commonly known as Philips, is a multinational Dutch electronics company....
(Philips Natuurkundig Laboratorium), he was the driving force behind establishing the Dutch Physical Society (Nederlands Natuurkundig Vereniging, NNV) in 1921. From 1939 until November 1940 he was Chairman of this Society. From 1918 until 1922 Ornstein was Chairman of the Dutch Zionist Society (Nederlandse Zionistische Vereniging). Immediately after the involvement of the Netherlands in the World War II
World War II
World War II, or the Second World War , was a global conflict lasting from 1939 to 1945, involving most of the world's nations—including all of the great powers—eventually forming two opposing military alliances: the Allies and the Axis...
(see Battle of the Netherlands
Battle of the Netherlands
The Battle of the Netherlands was part of Case Yellow , the German invasion of the Low Countries and France during World War II. The battle lasted from 10 May 1940 until 14 May 1940 when the main Dutch forces surrendered...
), a friend from the United States of America
United States
The United States of America is a federal constitutional republic comprising fifty states and a federal district...
, the astronomer
Astronomer
An astronomer is a scientist who studies celestial bodies such as planets, stars and galaxies.Historically, astronomy was more concerned with the classification and description of phenomena in the sky, while astrophysics attempted to explain these phenomena and the differences between them using...
Peter van de Kamp
Peter van de Kamp
Piet van de Kamp , known as Peter van de Kamp in the United States, was a Dutch astronomer who lived most of his life in the United States. He was professor of astronomy at Swarthmore College and director of the college's Sproul Observatory from 1937 until 1972...
, offered to bring Ornstein and his family to America. However, Ornstein did not accept this offer, since, as he put it, he would not leave his laboratory in Utrecht. Owing to his Jewish heritage, Ornstein was summarily dismissed from University in September 1940; he was even barred from entering his own laboratory. In November 1940, he was officially dismissed from University. On his own initiative, on November 29, 1940, Ornstein withdrew his membership of the Dutch Physical Society. During this period he increasingly distanced himself from public life, to the degree that he no longer wished to receive guests at home. Ornstein died on May 20, 1941, six months after being barred from University.
One of the five buildings of Department of Physics of University of Utrecht, Ornstein Laboratorium, is named in his honor.
External links
- Snelders H.A.M. (2007-02-01). "Ornstein, Leonard Salomon (1880-1941)", in: Biografisch Woordenboek van Nederland. Retrieved on 2007-03-30. (in DutchDutch languageDutch is a West Germanic language and the native language of the majority of the population of the Netherlands, Belgium, and Suriname, the three member states of the Dutch Language Union. Most speakers live in the European Union, where it is a first language for about 23 million and a second...
). - Multilevel wavelet solver for the Ornstein-Zernike equation Abstract
- Analytical solution of the Ornstein-Zernike equation for a multicomponent fluid
- The Ornstein-Zernike equation in the canonical ensemble