Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Help about the exchange energy

  1. Jun 15, 2008 #1

    hi everyone here ,
    i have a problem about the exhange energy .
    IN quantum mechanics, there is a example how to solve eigenvalue and eigenfunction of helium within the framework of perturbation theory .

    when two electrons are in different eigenstates,the first order correction of energy is :E(1)=k+(-)J
    K:coulomb energy
    and J is exhcange energy
    when + : spin anti-parallel
    and -: spin parallel

    and recently i have read about hartree-fock theory ,and found the exchange-energy exists only spin-parallel. Exchange integrals additionally arise if the electrons are of the same spin

    so my problen is why there is inconsistency between them ?
  2. jcsd
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

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

Similar Threads - Help exchange energy Date
A General quantum measurements Jan 18, 2018
I Dirac algebra help Dec 25, 2017
B Particle Spin Nov 12, 2017
A Topological Quantum Field Theory: Help reading a paper Nov 6, 2017
Help with Heisenberg's "isospin" Hamiltonian Nov 6, 2014