[time-nuts] Why Cesium and Rubidium only
Dr Bruce Griffiths
bruce.griffiths at xtra.co.nz
Fri Jul 27 08:24:48 EDT 2007
Bob Paddock wrote:
> 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?
>
>
>
>
Bob
NIST are working on both Calcium (456 THz) and Ytterbium (519 THz)
neutral atom optical clocks.
They have also done some work on the Mercury ion (1064.7 THz) optical
standard.
Bruce
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