The tick-tock of the optical clock NPL time scientists have made an accurate measurement of the highly forbidden octupole transition frequency in an ytterbium ion, which could be used as the basis for the next generation of optical atomic clocks - see: http://www.npl.co.uk/news/the-tick-tock-of-the-optical-clock Cheers, David -- SatSignal software - quality software written to your requirements Web: http://www.satsignal.eu Email: david-taylor@blueyonder.co.uk

Hi David, very similar work was done at PTB in Germany http://www.ptb.de/en/aktuelles/archiv/presseinfos/pi2012/pitext/pi120301.html ... the charm of forbidden things... Best regards Bernd Neubig AXTAL GmbH & Co. KG www.axtal.com ----- Original Message ----- From: "David J Taylor" <david-taylor@blueyonder.co.uk> To: "Time-nuts mailing list" <time-nuts@febo.com> Sent: Friday, April 27, 2012 11:30 AM Subject: [time-nuts] OT: The tick-tock of the optical clock .... > The tick-tock of the optical clock > > NPL time scientists have made an accurate measurement of the highly > forbidden octupole transition frequency in an ytterbium ion, which could > be used as the basis for the next generation of optical atomic clocks - > see: > > http://www.npl.co.uk/news/the-tick-tock-of-the-optical-clock > > Cheers, > David > -- > SatSignal software - quality software written to your requirements > Web: http://www.satsignal.eu > Email: david-taylor@blueyonder.co.uk > > _______________________________________________ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there.

> Hi David, > > very similar work was done at PTB in Germany > http://www.ptb.de/en/aktuelles/archiv/presseinfos/pi2012/pitext/pi120301.html > > ... the charm of forbidden things... > > Best regards > > Bernd Neubig Danke, David -- SatSignal software - quality software written to your requirements Web: http://www.satsignal.eu Email: david-taylor@blueyonder.co.uk

Yes I built mine up with tin snips, a flashlight, and epoxy. Regards Paul On Fri, Apr 27, 2012 at 6:24 AM, David J Taylor < david-taylor@blueyonder.co.uk> wrote: > Hi David, >> >> very similar work was done at PTB in Germany >> http://www.ptb.de/en/**aktuelles/archiv/presseinfos/** >> pi2012/pitext/pi120301.html<http://www.ptb.de/en/aktuelles/archiv/presseinfos/pi2012/pitext/pi120301.html> >> >> ... the charm of forbidden things... >> >> Best regards >> >> Bernd Neubig >> > > Danke, > > > David > -- > SatSignal software - quality software written to your requirements > Web: http://www.satsignal.eu > Email: david-taylor@blueyonder.co.uk > > ______________________________**_________________ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to https://www.febo.com/cgi-bin/** > mailman/listinfo/time-nuts<https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts> > and follow the instructions there. >

I believe that NPL and PTB are working together on this project. Rob Kimberley -----Original Message----- From: time-nuts-bounces@febo.com [mailto:time-nuts-bounces@febo.com] On Behalf Of David J Taylor Sent: 27 April 2012 11:24 To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] OT: The tick-tock of the optical clock .... > Hi David, > > very similar work was done at PTB in Germany > http://www.ptb.de/en/aktuelles/archiv/presseinfos/pi2012/pitext/pi1203 > 01.html > > ... the charm of forbidden things... > > Best regards > > Bernd Neubig Danke, David -- SatSignal software - quality software written to your requirements Web: http://www.satsignal.eu Email: david-taylor@blueyonder.co.uk _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.

Rob, you are right. My wording was not precise enough, sorry. Regards Bernd DK1AG AXTAL GmbH & Co. KG www.axtal.com ----- Original Message ----- From: "Rob Kimberley" <robkimberley@btinternet.com> To: "'Discussion of precise time and frequency measurement'" <time-nuts@febo.com> Sent: Friday, April 27, 2012 4:45 PM Subject: Re: [time-nuts] OT: The tick-tock of the optical clock .... >I believe that NPL and PTB are working together on this project. > > Rob Kimberley > > -----Original Message----- > From: time-nuts-bounces@febo.com [mailto:time-nuts-bounces@febo.com] On > Behalf Of David J Taylor > Sent: 27 April 2012 11:24 > To: Discussion of precise time and frequency measurement > Subject: Re: [time-nuts] OT: The tick-tock of the optical clock .... > >> Hi David, >> >> very similar work was done at PTB in Germany >> http://www.ptb.de/en/aktuelles/archiv/presseinfos/pi2012/pitext/pi1203 >> 01.html >> >> ... the charm of forbidden things... >> >> Best regards >> >> Bernd Neubig > > Danke, > > David > -- > SatSignal software - quality software written to your requirements > Web: http://www.satsignal.eu > Email: david-taylor@blueyonder.co.uk > > > _______________________________________________ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. > > > > _______________________________________________ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there.