Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

X-rays & Electrons

  1. Nov 20, 2004 #1

    NSX

    User Avatar

    @ howstuffworks.com, it says:

    I thought that only photons could knock and electron loose.

    How do electrons do the same?

    [edit]

    Actually, I was viewing this ppt file, and on slide 22-23, it shows the knocking loose of an electron with another electron as similar to a inelastic collision.

    Is this indeed the case?
     
    Last edited: Nov 20, 2004
  2. jcsd
  3. Nov 20, 2004 #2
    I hope this will help you

    Hi

    Your electron is interacting with electrons of your atom of tungstem through the electromagnetic force.
    He is changing is momentum and losing kinematic energy during this interaction. This energy loss goes to electrons of the tungsten and makes them change of orbitals.

    So, indeed, it is an inelastic collision, as in the photoelectric effect (exept that in our case, the photon interacting with the elctron is virtual...)

    If you're looking for further informations, you can read the books of Knoll or Leo (interactions of particles and matter)

    Bye
     
  4. Nov 23, 2004 #3

    ZapperZ

    User Avatar
    Staff Emeritus
    Science Advisor
    Education Advisor

    You may also want to look up the principle of Secondary Electron Emission. Photomultipliers, scanning electron microscopes, and many other devices make use of the emission of electrons by other electrons. So no, photons are not the only "agent" that can knock out electrons from solids or atoms.

    Zz.
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?



Similar Discussions: X-rays & Electrons
Loading...