[time-nuts] Re: thorium transitions

[Jürgen Appel]

Dear time nuts,

On Wednesday, 8 May 2024 12:20:24 CEST Gerhard Hoffmann via time-nuts wrote:

> On usenet, sci.electronics.design,
> there just develops a discussion on Thorium transitions that may
> be usable for clocks.
> I had not yet the time to delve into that.
> Unfortunately, s.e.d. has a bad S/N ratio. Too many trolls since not
> moderated.

There is a viewpoint on 
https://physics.aps.org/articles/v17/71

The Schumm and Peik groups worked together to narrow down the previously 
rather unknown transition frequency for the optical excitation of a Thorium 
nucleus by a factor of 800 to a few GHz uncertainty. 

Now the construction of narrow continuous wave 148 nm laser systems can begin 
and maybe soon the nuclear transition can be driven coherently.

The original article is also freely accessible:
https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.132.182501


Cheers,
	Jürgen