[time-nuts] Atomic clocks - Why alkali metals?

Magnus Danielson magnus at rubidium.dyndns.org
Sun Oct 30 15:53:11 UTC 2011

On 10/29/2011 09:55 PM, J. Forster wrote:
>> Ammonia was the first clock wasn't it?
> I think it was an amplifier, not an oscillator. Microwave Amplification by
> Stimulated Emission of Radiation = MASER.

The ammonia clocks was not operating in amplification mode, but in 
absorbtion mode similar to a rubidium gas cell.

The active H maser is the only self-amplifying maser being in wide use, 
all others are passive masers.


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