[time-nuts] vs Hg ion? Re: GPS clock stabilitiy, Rb vs Cs
magnus at rubidium.dyndns.org
Sun May 5 17:49:25 EDT 2013
On 05/05/2013 11:33 PM, Tom Knox wrote:
> The idea of a Mercury Ion clocks started about 2000 and from about 2005 until recently has held the title of worlds most accurate clock.
> Approx 1 sec per 1.6 billion years the last I heard. At the heart is a single trapped mercury atom. Jim Bergquist at NIST was one of those that lead the development.
> This link has the basics: http://tf.nist.gov/general/pdf/1957.pdf. I want two.
The history is older than that. A quick review of the early history is
First detection of the transition was in 1973.
Len Cutlers first article on the topic (as referenced in above article)
was back in 1981.
I have all the Hg-199 and Hg-202 I need for a few clocks, but in it's
natural mixture. Don't feel like building a separation facility...
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