8.1 eV or 153 nm is in the vacuum ultraviolet.  You might want to buy
a little stock in KM labs at
https://www.kmlabs.com/news-and-events/hyperion-vuv-talk .  I had no
idea that lasers like that were possible.  Such atomic clocks should
be able to see 1 mm difference in altitude between them.

On Sat, Nov 14, 2020 at 9:45 PM Gilles Clement <[email protected]> wrote:
>
> From time-nuts to time-nukes !
>
> https://physics.aps.org/articles/v13/152 
> <https://physics.aps.org/articles/v13/152>
>
> I like it,
> Gilles
> (retired nuclear engineer)
>
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