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Perturbation theory and spin

  1. Jun 24, 2010 #1
    In my quest to learn quantum mechanics I've become a little confused and I have a question.
    It is "In The Feynman Lectures on Physics Volume 3, is most of the work, eg. ammonia molecule done using perturbation theory or is this method something else, not perturbation theory?"
    I started to learn a little about perturbation theory elsewhere, and it seemed similar but not quite the same, so I'm a little foggy about this.
     
  2. jcsd
  3. Jun 24, 2010 #2
    I'm sorry, but I'm not sure what it is that you're asking?
     
  4. Jun 25, 2010 #3
    In the Feynman Lectures on Physics, Volume 3, Feynman uses a an approximation of treating systems as two state systems. Is this the same as perturbation theory, or is it a different method?
     
  5. Jun 25, 2010 #4
    I think the best answer, infuriating as it may be, is "yes".
    http://en.wikipedia.org/wiki/Perturbation_theory

    You can see there are elements of it there, but it's not a pure treatment for the reasons you mention, I think.
     
  6. Jun 25, 2010 #5
    Haha thanks for that, why infuriating?
     
  7. Jun 25, 2010 #6
    Generally people finding that the answer is "yes" to a yes or no question is infuriating. I'm glad you don't! :)
     
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