[time-nuts] Why Cesium and Rubidium only

[Bob Paddock]

On Friday 27 July 2007 04:14, Dr Bruce Griffiths wrote:

> 22GHz, 
> (15GHz)
> (~40.5 GHz) than either the caesium
> (9.192GHz) or rubidium   
> (6.8GHz)

Anything happening in the THz range, that anyone knows of?



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