Zobrazeno 1 - 8
of 8
pro vyhledávání: '"S R, Jefferts"'
Autor:
S R, Jefferts, T P, Heavner, T E, Parker, J H, Shirley, E A, Donley, N, Ashby, F, Levi, D, Calonico, G A, Costanzo
Publikováno v:
Physical review letters. 112(5)
We report a high-accuracy direct measurement of the blackbody radiation shift of the 133Cs ground-state hyperfine transition. This frequency shift is one of the largest systematic frequency biases encountered in realizing the current definition of th
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=pmid________::521a7fa47a668386e290f308070cdc74
https://pubmed.ncbi.nlm.nih.gov/24580583
https://pubmed.ncbi.nlm.nih.gov/24580583
Publikováno v:
Journal of Physics: Conference Series. 723:012005
With several Primary Frequency Standards (PFS) across the world demonstrating systematic fractional frequency uncertainties on order of 1 x 10-16, it is crucial to accurately measure or model even small frequency shifts that could affect the ultimate
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::668b3481d9502152ffe21ce1a880b663
https://doi.org/10.1088/1742-6596/723/1/012005
https://doi.org/10.1088/1742-6596/723/1/012005
Publikováno v:
IEEE transactions on ultrasonics, ferroelectrics, and frequency control. 51(6)
We have measured a previously unobserved systematic frequency shift in our cesium-fountain frequency standard, NIST-F1. This shift, predicted theoretically previously, mimics the well-known end-to-end phase shift in atomic beam standards when synchro
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=pmid________::39ec9bdb37ce2c8ef5036e5fd9afe15c
https://pubmed.ncbi.nlm.nih.gov/15244277
https://pubmed.ncbi.nlm.nih.gov/15244277
Autor:
S, Bize, S A, Diddams, U, Tanaka, C E, Tanner, W H, Oskay, R E, Drullinger, T E, Parker, T P, Heavner, S R, Jefferts, L, Hollberg, W M, Itano, J C, Bergquist
Publikováno v:
Physical review letters. 90(15)
Over a two-year duration, we have compared the frequency of the 199Hg+ 5d(10)6s (2)S(1/2)(F=0)--5d(9)6s(2) (2)D(5/2)(F=2) electric-quadrupole transition at 282 nm with the frequency of the ground-state hyperfine splitting in neutral 133Cs. These meas
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=pmid________::78ebdaa73e2e196bd433708760e43119
https://pubmed.ncbi.nlm.nih.gov/12732024
https://pubmed.ncbi.nlm.nih.gov/12732024
Publikováno v:
The Journal of Chemical Physics. 91:4593-4596
We have measured the rate coefficients for radiative (RCT) and dissociative (DCT) charge transfer from He+ to H2 at temperatures 15≲T≲40 K. We find the radiative charge transfer reaction to be essentially independent of temperature, while the rat
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::b52297b23a38e24cee2252b2a361d511
https://doi.org/10.1063/1.456748
https://doi.org/10.1063/1.456748
Autor:
S. R. Jefferts, F. L. Walls
Publikováno v:
Journal of Research of the National Bureau of Standards
A low noise amplifier has been designed using a 2SK117 N channel J-FET as the input device in a cascode [1] configuration. Noise measurements on this amplifier yield a low frequency noise current of 0.25 fA/Yfu and a voltage noise of less than 1.2 n
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::42c8f76a1fc64e1ae27965c80857eb19
https://doi.org/10.6028/jres.092.039
https://doi.org/10.6028/jres.092.039
Publikováno v:
Journal of Physics: Conference Series; 2016, Vol. 723 Issue 1, p1-1, 1p