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Link between Green Glow and Electron

  1. Jun 27, 2015 #1
    I just looking for Video on diffraction pattern of Electron, and noticed it produces green color pattern.
    Earlier in chapter, when cathode ray was discovered, it was mentioned that Green glow was Noticed.

    What is the reason for this green color?
  2. jcsd
  3. Jun 27, 2015 #2


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    Staff: Mentor

    Do you mean when an electron beam strikes a phosphorescent screen? In that case, the electrons excite atoms or molecules in the screen upon impact. When those atoms or molecules relax to their ground state, they emit characteristic wavelengths of light which depend on the nature of the phosphorescent material. In the devices that I've used over the years, some have glowed green, others have glowed blue.
  4. Jun 27, 2015 #3
    Hi, thank you very much for reply, I got it !
    I again watched the video and Yes it is just the screen glowing ..... Not the ray itself.

    and I guess in cathode ray experiment, It contained gas at law pressure...! so light produced was due to ionization of gas.
    Thank you again.
  5. Jun 28, 2015 #4


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    Staff Emeritus
    Science Advisor

    That sounds likely.
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