Plasma outside the visible

  1. So I friend of mine got into this interesting discussion about different kinds of plasmas in particular the various colors and plasma parameters of various ions (*mainly magnitude of frequency and velocity equation). One interesting question we both had was about the possibility of a plasma whose primary spectrum included stuff outside the visible. Other than possible star examples, where the plasma has an very high temperature, we both could not think of a normal ion or laboratory situation where the plasma might emit in a spectrum outside visible.

    So my question to you all was do you know any examples, laboratory-based or otherwise, of when a plasma's electromagnetic radiation lies outside the visible spectrum?
     
  2. jcsd
  3. I don't know much about this field myself, but I've heard of work done on ultra-cold plasma.

    http://physics.aps.org/synopsis-for/10.1103/PhysRevLett.101.195002
     
  4. ZapperZ

    ZapperZ 29,652
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    Er... look at the Hydrogen spectrum that you could get out of a simple hydrogen gas discharge tube that we use in a typical undergraduate laboratory. There's a reason we ask the students to look at the Balmer series - it is the only series where the transition is in the visible range. The Lyman and Paschen series, for example, are not. But they are certainly there!

    See http://hyperphysics.phy-astr.gsu.edu/hbase/tables/hydspec.html

    Zz.
     
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