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

[Poul-Henning Kamp]

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.


-- 
Poul-Henning Kamp       | UNIX since Zilog Zeus 3.20
phk at FreeBSD.ORG         | TCP/IP since RFC 956
FreeBSD committer       | BSD since 4.3-tahoe    
Never attribute to malice what can adequately be explained by incompetence.