Hi Tom,
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
available here:
http://tf.nist.gov/general/pdf/910.pdf
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...
Cheers,
Magnus
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