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A Hyperfine structure transition of Cs-133: calculation?

  1. May 5, 2016 #1
    I'm looking for the theoretical calculation of the hyperfine structure transition frequency of Ca-133 which is used in atomic clocks to define the second according to SI-Units. Google, Google... there is a lot about the hyperfine Hamiltonian of hydrogen, but couldn't find none about that of Ca-133. I would like to see how that famous 9,192,631,770 Hz frequency which defines our earthly time standard is calculated through theory. Can anyone help?
  2. jcsd
  3. May 5, 2016 #2


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    I think it should be Caesium not Calsium.
  4. May 5, 2016 #3
    Opss... You are right, Cs-133... not Ca. Thanks.
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