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Eugen Goldstein (/ ˈ ɔɪ ɡ ən / OY-gən, German: [ˈɔʏɡeːn ˈɡɔlt.ʃtaɪn, ˈɔʏɡn̩-]; 5 September 1850 – 25 December 1930) was a German physicist.He was an early investigator of discharge tubes, the discoverer of anode rays or canal rays, later identified as positive ions in the gas phase including the hydrogen ion.
They were first observed in Crookes tubes during experiments by the German scientist Eugen Goldstein, in 1886. [1] Later work on anode rays by Wilhelm Wien and J. J. Thomson led to the development of mass spectrometry .
Crookes X-ray tube from around 1910 Another Crookes x-ray tube. The device attached to the neck of the tube (right) is an "osmotic softener". When the voltage applied to a Crookes tube is high enough, around 5,000 volts or greater, [16] it can accelerate the electrons to a high enough velocity to create X-rays when they hit the anode or the glass wall of the tube.
They were first observed in 1859 by German physicist Julius Plücker and Johann Wilhelm Hittorf, [1] and were named in 1876 by Eugen Goldstein Kathodenstrahlen, or cathode rays. [2] [3] In 1897, British physicist J. J. Thomson showed that cathode rays were composed of a previously unknown negatively charged particle, which was later named the ...
1921–22: Stern–Gerlach experiment by Otto Stern and Walther Gerlach [472] 1924: Description of coincidence method by Walther Bothe [473] 1924–25: Bose–Einstein statistics, Bose–Einstein condensate and Boson by Albert Einstein [474] 1927: Free electron model by Arnold Sommerfeld [475] 1927: Uncertainty principle by Werner Heisenberg [476]
Close to an aperture or atoms, often called the "sample", the electron wave would be described in terms of near field or Fresnel diffraction. [12]: Chpt 7-8 This has relevance for imaging within electron microscopes, [1]: Chpt 3 [2]: Chpt 3-4 whereas electron diffraction patterns are measured far from the sample, which is described as far-field or Fraunhofer diffraction. [12]:
Background Chlorine and caustic soda are produced at chlor-alkali plants using mercury cells or the increasingly popular membrane technology that is mercury free and more energy-
Carl Auer von Welsbach patents his first incandescent gas mantle.; Eugen Goldstein names the cathode ray, later discovered to be composed of electrons, and the canal ray, later discovered to be positive hydrogen ions that have been stripped of their electrons in a cathode-ray tube; these will later be named protons.