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About susceptibility

  1. Sep 30, 2009 #1


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    I am reading a paper on applying an external field on a two-level system. And it turns out that at some frequency (of the field), the imaginary part of the susceptibility become very close to zero. I wonder what's the physical significance when imaginary part of the susceptibility is ZERO?

  2. jcsd
  3. Oct 3, 2009 #2

    Dr Transport

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    The imaginary part of the susceptibility is a related to the absorption, hence when it is zero, or nearly so, there isn't any absorption in the system.
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