[time-nuts] vs Hg ion? Re: GPS clock stabilitiy, Rb vs Cs

Poul-Henning Kamp phk at phk.freebsd.dk
Sun May 5 15:28:00 EDT 2013


In message <20130505205257.8497f166abb1e4918695353d at kinali.ch>, Attila Kinali w
rites:

>I also have never seen a H gas cell standard, probably for the same reason
>of needing UV light.

Hydrogen is very hard to contain.

The way you *filter* hydrogen is to press it through a palladium film,
and that doesn't take a particular high pressure.


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