1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
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: 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
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook

Can you offer guidance or do you also need help?
Draft saved Draft deleted