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Homework Help: Helium Absorption

  1. Mar 13, 2012 #1
    1. The problem statement, all variables and given/known data

    The atomic site that is in thermal and diffusive equilibrium with a gas of Helium atoms that is on the surface of a metal can either absorb an atom of Helium or it can be vacant.
    (a) What is the Grand Partition function of the system?
    (b) Derive the average thermal occupancy <N> of a site

    2. Relevant equations

    3. The attempt at a solution
    I have no idea where to even begin!
  2. jcsd
  3. Mar 14, 2012 #2
    The partition function is given by z = Ʃ e^ -β (Ni) (εi-μ)
    how do you account for the fact that the surface is either vacant or not
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