John Miles brought up an interesting question that got lost in the discussion of high vacuum systems: what about the choice of gas?
Besides H, there is a dual Xe/He system detailed in: http://www.cfa.harvard.edu/Walsworth/pdf/Bear%20thesis.pdf And, as mentioned before, Harvard has built Rb masers: http://cfa-www.harvard.edu/~dphil/work/coat.pdf<http://cfa-www.harvard.edu/%7Edphil/work/coat.pdf> <http://cfa-www.harvard.edu/%7Edphil/work/coat.pdf> And John mentioned HN3 masers (advantage: you would be able to smell the leak!). _______________________________________________ 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.
