Hi There were a number of trapped ion papers back in the 70's and 80's. The NIST effort to transition from Cs to an ion standard was well underway by the mid 1980's.
Bob On May 5, 2013, at 5:49 PM, Magnus Danielson <mag...@rubidium.dyndns.org> wrote: > 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 > _______________________________________________ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
