Walter Grotrian

Walter Robert Wilhelm Grotrian (21 April 1890 in Aachen; † 3 March 1954 in Potsdam) was a German astronomer and astrophysicist.

German physicists and chemists in 1920. Standing, left to right: Walter Grotrian, Wilhelm Westphal, Otto von Baeyer, Peter Pringsheim, Gustav Hertz. Sitting, left to right: Hertha Sponer, Albert Einstein, Ingrid and James Franck, Lise Meitner, Fritz Haber, Otto Hahn.

Grotrian studied the emission line from the solar corona in the green region of the spectrum; this emission line could not be attributed to any known chemical element and was thought to be a new element (which scientists named "coronium"). Grotrian and Bengt Edlén from Sweden demonstrated that the two observed emission lines arise from iron atoms that have lost about half their 26 electrons.[1]

Named after Grotrian
  • The impact crater Grotrian on the Moon
  • The Grotrian diagram in atomic spectroscopy showing the allowed transitions between atomic energy levels
  • Character in "Time Keeps on Slippin'" episode of Futurama
gollark: > random musing: obviously if the speed of light was lower, there would be less energy in those sort of reactions. What *other* trickle down effects would it have, though?There's some relation between c and some electromagnetic constants (permittivity and permeability of free space) so you would probably change those too.
gollark: Somewhat relevant point: seriously just use nuclear it's energy dense enough.
gollark: You might have to contend with running out of usable energy in 10^lots years or something, I suppose.
gollark: The inevitable end point of "no growth/no new stuff/etc" is just "society runs through all available resources, can't get more, dies out" or maybe "natural disaster occurs and limited economic/technological resources don't allow dealing with it well".
gollark: This is why I don't like the "zero-growth" people, as well as the various other reasons.

References
  1. ESO: The Glory of a Nearby Star


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