1. Not finding help here? Sign up for a free 30min 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!

Statistical mechanics hw

  1. Nov 21, 2006 #1
    I have a homework problem that is kinda driving me nuts...

    Consider the case of an anharmonic oscillator with microsystem quantum states given by Ej = jhf - (lambda)(jhf)^2.

    Using the known harmonic expressions as a starting point, determine the corresponding expression for F1 and for F, which is about equal to Fo + (lambda)F1.

    Can someone give me a hint on how to approach this problem? I figure I could find the partition function easily enough since Zj = sum(e^(-(beta)Ej)). I can then plug in Ej into the Zj function. However, I am not sure how to determine that sum. Am I even approaching this problem in the right way?

  2. jcsd
  3. Nov 22, 2006 #2


    User Avatar
    Science Advisor
    Homework Helper

    IF you have the partition function, how do you get the F ?

  4. Nov 22, 2006 #3


    User Avatar
    Science Advisor
    Gold Member

    Hi leright,
    looks like a perturbation problem to me. You don't need the perturbing potential V1 since you have the eigenvalue given in the form of an unperturbed part (relate that to the unperturbed H.O.) and a perturbation of strength lambda.
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?

Similar Discussions: Statistical mechanics hw
  1. Statistical mechanics (Replies: 2)

  2. Statistical Mechanics (Replies: 1)

  3. Statistical Mechanics (Replies: 1)

  4. Statistical Mechanics (Replies: 0)

  5. Statistical mechanics (Replies: 0)