[time-nuts] Rb resonance

Dave Brown tractorb at ihug.co.nz
Sat Sep 17 03:42:16 EDT 2005

The second is defined in terms of the Cs133 resonance- hence there is 
an integer number of Hz in the resonance frequency viz. 9192 631 770 
 But what about the Rb resonance frequency? It is always quoted as 
being an integer number of Hz as well- viz 6834 682 608 Hz.   Is there 
some aspect of the physics of these transition frequencies that means 
the Rb resonance has to be an integer number of Hz, based on the Cs133 
Or is the Rb resonance frequency, which is generally quoted as above, 
actually rounded to be an integer number of Hz for convenience? 
Perhaps a set of environmental conditions need to be specified as 

Dave Brown, NZ

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