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Quantum physics questions

  1. May 8, 2008 #1
    i) What is the energy required to singly ionise a ground state Helium atom into the first excited state of the helium ion?

    ii) What is the energy required to excite a ground state helium atom into the first excited state of neutral helium?

    iii) What is the energy required to doubly excite a ground state helium atom into the first doubly excited state of neutral helium?
     
  2. jcsd
  3. May 8, 2008 #2

    Hootenanny

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    Welcome to PF Ecniv,

    You are expected to show some effort in solving the questions yourself.
     
  4. May 11, 2008 #3

    Hootenanny

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    Let me rephrase, you are required to show some effort in solving the question yourself before we will help you.

    What are the concepts involved? What have you tried thus far?
     
  5. May 11, 2008 #4

    malawi_glenn

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    You might want to have a look at the rules for this forum.
     
  6. May 12, 2008 #5
    Same Problem

    Hi

    I have the same questions

    For i) I know we want to ionise the ground state Helium atom from 1s^2 to the first excited state of the helium ion which is 1s^1 2p^1 I think

    So that means we want the original ionisation energy +that to bump it up

    but im not sure what the energy to bump it up would be

    using the basic binding energy formula E=(-Z^2 R)/( n^2) doesnt seem to give me a decent value for n =2 and Z=2 and im not sure how to incorporate sceening charge
     
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