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

Homework Help: Hydrogen Excitation(s) and De-excitation(s)

  1. Dec 5, 2008 #1
    Hydrogen Excitation(s) and De-excitation(s) via electron beam

    1. The problem statement, all variables and given/known data

    A sample of hydrogen atoms (i'm assuming singular, not molecular hydrogen) is bombarded by a low-energy electron beam (12.0eV).

    My question is: with this group of atoms being bombarded, is it possible to excite the electron past the first excitation state (n=2) in a cascading sort of way? After an electron has made the jump to first excited state, could the excited atom(s) be again excited by a follwing electron?

    2. Relevant equations

    I'm not even sure.

    3. The attempt at a solution

    E1-2=-3.40eV - (-13.6eV) = 10.2eV

    10.2eV < electron beam energy of 12.0eV

    So, the atom can go to the first excited state...but, now i'm lost.
    Last edited: Dec 5, 2008
  2. jcsd
  3. Dec 5, 2008 #2
    never mind, I thought about it for about 3 more minutes and realized how fried I am from this past week.
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook