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

1. Dec 5, 2008

### mattmartindri

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. Dec 5, 2008

### mattmartindri

never mind, I thought about it for about 3 more minutes and realized how fried I am from this past week.