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Metrologia, ISSN 0026-1394, 10/2011, Volume 48, Issue 5, pp. 283 - 289
We evaluate the distributed cavity phase (DCP) and microwave lensing frequency shifts, which were the two largest sources of uncertainty for the NPL-CsF2... 
ATOMIC CLOCKS | INSTRUMENTS & INSTRUMENTATION | PHYSICS, APPLIED | CESIUM FOUNTAIN
Journal Article
IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control, ISSN 0885-3010, 03/2019, Volume 66, Issue 3, pp. 624 - 631
We report on the design, assembly, testing, and delivery of a series of new cesium fountain primary frequency standards built through commercial and scientific... 
Atomic measurements | Laboratories | Microwave theory and techniques | Cesium | primary frequency standards | Acoustics | timescales | Frequency control | Atomic clocks | ACOUSTICS | FREQUENCY STANDARD | TIME | DISTRIBUTED CAVITY PHASE | 1ST ACCURACY EVALUATION | ENGINEERING, ELECTRICAL & ELECTRONIC | Frequency standards | Fountains | Redundancy | Clocks
Journal Article
IEEE Transactions on Instrumentation and Measurement, ISSN 0018-9456, 07/2011, Volume 60, Issue 7, pp. 2475 - 2481
Journal Article
Metrologia, ISSN 0026-1394, 08/2010, Volume 47, Issue 4, pp. 363 - 376
An accuracy evaluation of the caesium fountain NPL-CsF2 as a primary frequency standard is reported. The device operates with a simple one-stage... 
SHIFT | DESIGN | INSTRUMENTS & INSTRUMENTATION | PHYSICS, APPLIED | CESIUM-FOUNTAIN | POWER DEPENDENCE | ATOMIC FOUNTAIN CLOCK | CSF1 | UNCERTAINTY EVALUATION | DISTRIBUTED CAVITY PHASE | TRANSITIONS | COLLISIONS | Frequency shift | Uncertainty | Stability | Clouds | Frequency standards | Instability | Devices | Cold atoms | Density
Journal Article
IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control, ISSN 0885-3010, 01/2014, Volume 61, Issue 1, pp. 203 - 206
Journal Article
Applied Physics B: Lasers and Optics, ISSN 0946-2171, 05/2013, Volume 111, Issue 3, pp. 527 - 535
We have implemented and optimized a technique of spin polarization by optical pumping in a caesium atomic fountain, gaining a nearly fivefold increase in the... 
PHYSICS, APPLIED | ELECTROMAGNETICALLY INDUCED TRANSPARENCY | FOUNTAIN | PRIMARY FREQUENCY STANDARD | SHIFTS | OPTICS | ACCURACY | Light | Polarization | Clouds | Heating | Cesium | Caesium | Optical pumping | Cold atoms | Interferometers
Journal Article
Journal of Physics B: Atomic, Molecular and Optical Physics, ISSN 0953-4075, 01/2007, Volume 40, Issue 2, pp. 343 - 350
We have employed an intuitive model and 3D Monte Carlo simulations to study the effect of ballistic expansion of the atomic cloud on the collision energies and... 
FREQUENCY STANDARD | SHIFTS | OPTICS | CLOCKS | CESIUM | PHYSICS, ATOMIC, MOLECULAR & CHEMICAL
Journal Article
Physical Review A - Atomic, Molecular, and Optical Physics, ISSN 1050-2947, 05/2005, Volume 71, Issue 5
The preparation of a sample of ultra cold caesium atoms in an m(F)=0 Zeeman sublevel of the F=3 ground state is demonstrated, using cooling in an optical... 
OPTICAL LATTICE | INTERFEROMETER | EFFICIENCIES | CESIUM | PHYSICS, ATOMIC, MOLECULAR & CHEMICAL | SHIFTS | OPTICS | POPULATION TRANSFER | LASER RADIATION | EXCITED STATES | EXCITATION | ATOMIC AND MOLECULAR PHYSICS | ABSORPTION SPECTROSCOPY | TEMPERATURE RANGE 0000-0013 K | MICROWAVE RADIATION | COOLING | ATOMS | MICROWAVE SPECTRA | ZEEMAN EFFECT | RADIATION PRESSURE | EFFICIENCY | GROUND STATES
Journal Article
METROLOGIA, ISSN 0026-1394, 06/2020, Volume 57, Issue 3, p. 35010
We report the first accuracy evaluation of NRC-FCs2, an atomic fountain clock developed at the National Research Council Canada. The short term stability at... 
FOUNTAIN CLOCK | PHYSICS, APPLIED | atomic clock | SHIFTS | DISTRIBUTED CAVITY PHASE | OPTICAL CLOCKS | cold atoms | primary frequency standard | INSTRUMENTS & INSTRUMENTATION | UNCERTAINTY | OFFSET | GNSS frequency comparison | TRANSITIONS | PTB | Frequency standards
Journal Article
Journal of Physics B: Atomic, Molecular and Optical Physics, ISSN 0953-4075, 03/2006, Volume 39, Issue 5, pp. 1081 - 1089
Adiabatic passage with optical pulses has been used as an efficient tool for the transfer of atomic populations between Zeeman sublevels. The composition of... 
SHIFTS | OPTICS | EFFICIENCIES | PHYSICS, ATOMIC, MOLECULAR & CHEMICAL
Journal Article
2019 URSI Asia-Pacific Radio Science Conference (AP-RASC), 03/2019, pp. 1 - 1
Maintaining a robust and largely autonomous timescale is a task not only for national measurement institutes, but also for timing labs at large scientific... 
Atomic measurements | Optical fibers | Local oscillators | Masers | Cavity resonators | Thermal stability | Clocks
Conference Proceeding
Metrologia, ISSN 0026-1394, 08/2015, Volume 52, Issue 4, p. 595
  The results of precision measurements of the 87Rb ground-state hyperfine transition frequency, which were conducted at NPL from 2009 to 2013, are reported.... 
Measurement | Frequencies
Journal Article
IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control, ISSN 0885-3010, 2018
Journal Article
Journal of Agricultural and Food Chemistry, ISSN 0021-8561, 01/2002, Volume 50, Issue 2, pp. 384 - 389
Biological activity tests were performed on α-galactoside preparations obtained from Lupinus angustifolius L. cv. Mirela (alkaloid-rich) and Pisum sativum L.... 
Immunotropic activity | Lupin | α-Galactosides | Bifidobacteria | Toxicity | Pea | toxicity | bifidobacteria | OLIGOSACCHARIDES | alpha-galactosides | lupin | immunotropic activity | FOOD SCIENCE & TECHNOLOGY | AGRICULTURE, MULTIDISCIPLINARY | HEALTH | CHEMISTRY, APPLIED | pea | Animals | Fabaceae - chemistry | Galactosides - toxicity | Galactosides - metabolism | Mice | Seeds - chemistry | Lethal Dose 50
Journal Article
Metrologia, ISSN 0026-1394, 08/2015, Volume 52, Issue 4, pp. 595 - 599
The results of precision measurements of the Rb-87 ground-state hyperfine transition frequency, which were conducted at NPL from 2009 to 2013, are reported.... 
frequency standards | atomic fountains | frequency measurements | INSTRUMENTS & INSTRUMENTATION | PHYSICS, APPLIED | SHIFTS | DISTRIBUTED CAVITY PHASE | STANDARD | ACCURACY
Journal Article
2019 URSI Asia-Pacific Radio Science Conference (AP-RASC), 03/2019, pp. 1 - 2
The National Research Council of Canada is finalizing the first evaluation of a new primary frequency standard, the NRC-FCs2 cesium fountain clock. The physics... 
Uncertainty | Microwave oscillators | Cavity resonators | Standards | Frequency control | Physics | Clocks
Conference Proceeding
Metrologia, ISSN 0026-1394, 10/2011, Volume 48, Issue 5, p. 283
  We evaluate the distributed cavity phase (DCP) and microwave lensing frequency shifts, which were the two largest sources of uncertainty for the NPL-CsF2... 
Measurement | Uncertainty | Accuracy | Approximations | Microwaves
Journal Article
2017 Joint Conference of the European Frequency and Time Forum and IEEE International Frequency Control Symposium, EFTF/IFC 2017 - Proceedings, 10/2017, pp. 640 - 641
Conference Proceeding
Metrologia, ISSN 0026-1394, 08/2010, Volume 47, Issue 4, p. 363
  An accuracy evaluation of the caesium fountain NPL-CsF2 as a primary frequency standard is reported. The device operates with a simple one-stage... 
Frequency synthesizers | Accuracy | Temperature | Noise | Atoms & subatomic particles | Oscillators
Journal Article
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