Christian Christiansen
Encyclopedia
Christian Christiansen was a Danish physicist.

Christiansen first taught at the local polytechnical school. In 1886 he was appointed to a chair for 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...

.

He mainly studied radiant heat and optical dispersion
Dispersion (optics)
In optics, dispersion is the phenomenon in which the phase velocity of a wave depends on its frequency, or alternatively when the group velocity depends on the frequency.Media having such a property are termed dispersive media...

, discovering the Christiansen effect
Christiansen effect
The Christiansen effect is named after the Danish physicist Christian Christiansen the effect of this filter is based on the various dispersions of two different media....

 (Christiansen filter). He found numerous absorption spectra with abnormal dispersion
Dispersion (optics)
In optics, dispersion is the phenomenon in which the phase velocity of a wave depends on its frequency, or alternatively when the group velocity depends on the frequency.Media having such a property are termed dispersive media...

, among them aniline red.

In 1884 he confirmed the Stefan–Boltzmann law.

Christiansen was elected a member of the Royal Swedish Academy of Sciences
Royal Swedish Academy of Sciences
The Royal Swedish Academy of Sciences or Kungliga Vetenskapsakademien is one of the Royal Academies of Sweden. The Academy is an independent, non-governmental scientific organization which acts to promote the sciences, primarily the natural sciences and mathematics.The Academy was founded on 2...

 in 1902.

He was doctoral advisor to 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...

.

Citations

  • C. Christiansen, Lærebog i fysik, Copenhagen, 1892
  • C. Christiansen, Indledning til den mathematiske Fysik, 2 Bde, 1887-1889
  • C. Christiansen, Untersuchungen über die optischen Eigenschaften von fein vertheilten Körpern - Erste Mittheilung, Ann. Phys., Vol. 23, pp. 298-306, 1884
  • C. Christiansen, Untersuchungen über die optischen Eigenschaften von fein vertheilten Körpern - Zweite Mittheilung, Ann. Phys., vol. 24, pp. 439-446, 1885
  • C. Christiansen Elements of Theoretical Physics translated into English by W. F. Magie from the German translation of Muller (London, McMillan, 1897)

External links

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