[Lowfer] "WE" in QRSS-60 now and freq measurements...

[Ed Phillips]

Jay Rusgrove wrote:
> 
> Ed
> 
> I seem to recall 1 X 10 ^-15. Does that agree with what you saw?
> 
> Jay Rusgrove, W1VD

	I'm looking at the Science article on line, courtesy of Mike (thanks)
and the NIST site.  Figure 3 shows an Alan variance of 8E-16 for an
averaging time of 100 seconds, compared to 6E-15 for "the best stability
reported  with a Cs microwave standard". For one second averaging time
the variance is 7E-15, compared to 7E-14 for the Cs standard.  I must
confess that I don't really understand the description of operation,
except that it looks mighty complicated to me.  The title is
interesting:

	"An Optical Clock Based on a Single Trapped "199"Hg"+" Ion"

(The "" indicate that the enclosed numbers are shown in superscript.)

Ed

P.S. You have to be a registered AAAS member to access those records.