Anode ray

Anode ray

Anode rays (or Canal rays) were observed in experiments by a German scientist, Eugen Goldstein, in 1886. Goldstein used a gas discharge tube which had a perforated cathode. A "ray" is produced in the holes (canals) in the cathode and travels in a direction opposite to the "cathode rays," which are streams of electrons. Goldstein called these positive rays "Kanalstrahlen" - canal rays because it looks like they are passing through a canal. In 1907 a study of how this "ray" was deflected in a magnetic field, revealed that the particles making up the ray were not all the same mass. The lightest, formed when there was a little hydrogen in the tube, was calculated to be 1837 times as massive as an electron. They were protons.

ee also

*J. J. Thomson
*Wilhelm Wien
*Mass spectrometry

External links

* [http://members.chello.nl/~h.dijkstra19 The Cathode Ray Tube site]
* [http://www.archive.org/details/RaysOfPositiveElectricity Rays Of Positive Electricity by J.J. Thomson (1913)]


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