WebDec 1, 2024 · To evaluate its performance, the opticlock was compared to a PTB 171 Yb + ion clock operating on the E3 (2 S 1/2 - 2 F 7/2) transition. The opticlock shows a fractional instability of about 6 × 10 −15 / sqrt( t ), where t is the averaging time in seconds, and averages down to below 2 × 10 −17 . Webreliability of the PTB primary fountain clocks S Weyers, V Gerginov, M Kazda et al.-Accuracy evaluation of ITCsF2: a nitrogen cooled caesium fountain Filippo Levi, Davide Calonico, Claudio E Calosso et al.-First international comparison of fountain primary frequency standards via a long distance optical fiber link J Guéna, S Weyers, M Abgrall ...
Towards a transportable aluminium ion quantum logic optical clock …
WebWe have measured the absolute frequency of the optical lattice clock based on 87Sr at PTB with an uncertainty of 3.9 10× −16 using two caesium fountain clocks. This is close to the accuracy of todayʼs best realizations of the SI second. The absolute frequency of the 5s21S 0 – 5s5p 3P 0 transition in 87Sr is 429 228 004 229 873.13(17) Hz. WebAug 9, 2016 · The two strontium optical lattice clocks Sr SYRTE and Sr PTB are located at the national metrology institutes LNE-SYRTE in Paris 5,23, France and PTB in Braunschweig 21,22, Germany. At each ... early american prescut glassware pieces
Physikalisch-Technische Bundesanstalt, PTB hiring Scientist with …
WebDec 1, 2024 · To evaluate its performance, the opticlock was compared to a PTB 171 Yb + ion clock operating on the E3 (2 S 1/2 - 2 F 7/2) transition. The opticlock shows a fractional instability of about 6 × 10 −15 / sqrt( t ), where t is the averaging time in seconds, and averages down to below 2 × 10 −17 . Web41 minutes ago · The most expensive wedding state for yet another year? New Jersey, where a wedding will cost an average of $51,000. The least expensive weddings, on average, can be thrown in Kansas, Oklahoma and ... WebNov 2, 2024 · The second: Optical atomic clocks. Optical atomic clocks are the next generation of atomic clocks. Currently, they are still at the development stage. In the case of today's atomic clocks, the clock frequency lies in the microwave range, and cesium atoms are usually used as a reference. In the case of optical clocks, the clock frequency is more ... css text vertical-align middle