[time-nuts] Atomic clocks - Why alkali metals?
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.
More information about the time-nuts