[time-nuts] Zeeman frequency oddness

Magnus Danielson magnus at rubidium.dyndns.org
Sun Oct 28 10:32:30 EDT 2012


On 10/28/2012 03:06 PM, Tom Van Baak (lab) wrote:
> Chuck,
>
> Information about the HP submarine cesium standard (5062c) as well as details about Zeeman splitting are here:
> http://www.leapsecond.com/museum/hp5062c/theory.htm

At the bottom of that page you find:

"The C-Field can be used to make small frequency adjustments of the 
instrument to bring its frequency closer to that of a desired reference 
frequency. The dependence of the frequency on magnetic field is given by 
f = 9192631770 + 8.7026x10-10fz2, where f and fz are in Hertz. The 
Zeeman frequency, fz, is the average difference in frequency between the 
3,0 to 4,0 transition and the adjacent field-dependent transitions. fz 
has a linear dependence on magnetic field."

The Zeeman frequency depends on the magnetic field you apply, and the 
one different between different tubes is the C-field coil, so that the 
same current will give different C-field strength and hence different 
Zeeman frequencies. Adjust your C-field current and field separation 
will be different.

What Zeeman frequency splitting is useful to put the resonance on 
SI-second for a particular tube depends on other factors.

Cheers,
Magnus




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