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Displaying records 41 to 50 of 85 records.
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41. Weight Functions for Biases in Atomic Frequency Standards
Topic: Atomic Physics
Published: 10/5/2008
Author: Jon Hardy Shirley
Abstract: We present a unified treatment of frequency-standard biases that vary significantly during the time of measurement. We introduce three time-dependent weight functions built from the solution of the unperturbed equations of motion for a two-level sys ...

42. Ratio of the Al^u+^ and Hg^u+^ Optical Clock Frequencies to 17 Decimal Places
Topic: Atomic Physics
Published: 8/25/2008
Authors: Wayne M Itano, Till P Rosenband, David Hume, P.O. Schmidt, Chin W. Chou, A. Brusch, Luca Lorini, Windell Oskay, Robert E. Drullinger, Sarah Bickman, Tara Michele Fortier, Jason Stalnaker, Scott A Diddams, William C Swann, Nathan Reynolds Newbury, David J Wineland, James C Bergquist
Abstract: Frequency standards (atomic clocks) based on narrow optical transitions in ^u27^Al^u+^ and ^u199^Hg^u+^ have been developed over the past several years at NIST. These two types of standards are both based on single ions confined in Paul traps, but di ...

43. Robust Optical Design of Angled Multilayer Dielectric Mirrors Optimized for Rubidium Vapor Cell Return Reflection
Topic: Atomic Physics
Published: 8/1/2008
Authors: M A Perez, John E Kitching, A Shkel
Abstract: This paper reports on the design and implementation of thin film multilayer dielectric reflectors on the sidewalls of micromachined reflector cells. Due to shadowing within the cavity, significant variations in the thicknesses of the thin films will ...

44. Quantum key distribution at GHz transmission rates
Topic: Atomic Physics
Published: 2/11/2008
Authors: Alessandro Restelli, Joshua C Bienfang, Alan Mink, Charles W Clark
Abstract: Quantum key distribution (QKD) channels are typically realized by transmitting and detecting single photons, and therefore suffer from dramatic reductions in throughput due to both channel loss and noise. These shortcomings can be mitigated by applyi ...

45. Spin-resolved Superelastic Electron Scattering from Laser Excited Chromium Atoms
Topic: Atomic Physics
Published: 11/14/1993
Authors: G Hanne, Jabez J McClelland, R E. Scholten, Robert Celotta
Abstract: Superelastic scattering of polarized electrons from laser-excited polarized chromium atoms (4^u7^P^uo^^d4^ {rarr} 4^u7^S^d3^ transition, energy gain 2.92 eV) has been measured for total collision energies of 6.8 and 13.6 eV (0.5 and 1.0 Ryd) and scat ...

46. Uncertainty Intervals for Polarized Beam Scattering Asymmetry Statistics
Topic: Atomic Physics
Published: 7/1/1993
Authors: Kevin J Coakley, Jabez J McClelland, Michael H Kelley, Robert Celotta
Abstract: In many scattering experiments, the quantity of most direct physical interest is a measure of the difference between two closely related scattering signals, each generated by a Poisson scattering process. This difference is often expressed in terms o ...

47. Spin-Resolved Elastic Scattering of Electrons from Sodium
Topic: Atomic Physics
Published: 4/1/1993
Authors: Steven Ray Lorentz, R E. Scholten, Jabez J McClelland, Michael H Kelley, Robert Celotta
Abstract: Angle-resolved ratios of the separate triplet and singlet spin channel cross sections have been measured for elastic scattering of spin-polarized electrons from optically pumped spin-polarized sodium atoms. The triplet-to-singlet ratios axe reported ...

48. Production of a Spin-Polarized Atomic Cr Beam Using Optical Pumping Methods
Topic: Atomic Physics
Published: 1/1/1993
Authors: Jabez J McClelland, R E. Scholten, Robert Celotta

49. Determination of Complex Scattering Amplitudes in Low-Energy Elastic Electron-Sodium Scattering
Topic: Atomic Physics
Published: 11/1/1992
Authors: Jabez J McClelland, Steven Ray Lorentz, R E. Scholten, Michael H Kelley, Robert Celotta
Abstract: Measurements of spin-resolved elastic electron-sodium scattering have been carried out at incident energies of 4.1 and 12.1 eV, and the ratio of triplet to singlet scattering cross sections has been obtained at each energy. The ratio is used to provi ...

50. Scattering of Polarized Electrons from Optically Pumped Sodium Atoms
Topic: Atomic Physics
Published: 1/1/1992
Authors: Michael H Kelley, Jabez J McClelland, Steven Ray Lorentz, R E. Scholten, Robert Celotta
Abstract: We have measured the spin-dependence for elastic and superelastic scattering of spin-polarized electrons from optically prepared sodium atoms at selected incident energies from 1.0 to 54.4 eV and for scattering angles ranging from 10-degrees to 140-d ...

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