[time-nuts] Choice of MASER gas

J. Forster jfor at quik.com
Thu Sep 2 17:47:38 UTC 2010

FYI, Ron Walsworth did his PhD in Prof. Ike Silvera's Group at Harvard.
Among his advisors were Robert Vesseau of SAO/CFA, the builder of a number
of very high performance H2 MASERS.

Ron's experiment was trying to build an H2 MASER with superfluid He coated




> 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!).
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