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EPR spin selection rules

  1. Jan 27, 2008 #1

    I got al little bit confused about spins flipping in an EPR experiment. As far as I know, the idea of EPR is to measure the absorption of an electromagnetic wave induced by spin flips if the energy is conserved by
    [tex]\hbar \omega = g_{spin} \mu_B B_0[/tex].
    But now I heard several times that a spin cannot be flipped by an electromagnetic dipole field and only optical transitions that include
    [tex]\Delta m_s = 0[/tex]
    are permitted if there is zeeman splitting.
    So how do spins flip then?

    Thank you for all answers!
    Last edited: Jan 27, 2008
  2. jcsd
  3. Jan 30, 2008 #2
    check out Stephen Bundell book, "Magnetism in condensed matter". It has a good discussing on ESR.
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