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Adsorption - Pre Exponential frequency factor

  1. Apr 24, 2013 #1
    1. The problem statement, all variables and given/known data
    I have an adsorption reaction [itex] A+* \leftrightharpoons A^*[/itex]
    Then I am to finde the rate constants and these should be given by an Arhennius relation, e.g. from left to right in the reaction:
    [itex] k_+ = f_+\exp(-\Delta E_a/k_bT)[/itex] where the delta energy is the activation energy and f+ is the frequency factor

    My question is, how do you find that pre-exponential factor? And this should be from theory and i'd rather use statistical mechanics(partition functions)

    3. The attempt at a solution
    I have seen it written as easy as: [itex] f_+ = \dfrac{k_bT}{h}[/itex]
    but I suspect I am missing some partition functions or so?
    This is maybe chemistry but I need a physisits opinion and stringent use of units.
  2. jcsd
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