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Displaying 2576 - 2600 of 3361

Laser Cooling of Erbium Atoms

May 21, 2005
Author(s)
Jabez J. McClelland, H Y. Ban, Marcus Jacka, James L. Hanssen, Joseph Reader
We have identified five closed, or nearly-closed, J ? J + 1 transitions in atomic erbium at wavelengths of 401 nm, 583 nm, 631 nm, 841 nm, and 1299 nm. These transitions can be reached by common tunable single-frequency laser systems, and are thus in

The New Beamline 3 at SURF III for Source-Based Radiometry

March 1, 2002
Author(s)
Ping-Shine Shaw, D A. Shear, R Stamilio, Uwe Arp, Howard W. Yoon, Robert D. Saunders, Albert C. Parr, Keith R. Lykke
The Synchrotron Ultraviolet RAdiation Facility (SURF III) at the National Institute of Standards and Technology provides a unique opportunity for high-accuracy UV to infrared radiometry due to the 70-fold improvement in the uniformity of the magnetic field

Hyperfine-mediated electric quadrupole shifts in Al+ and In+ ion clocks

April 6, 2017
Author(s)
Kyle P. Beloy, David R. Leibrandt, Wayne M. Itano
We evaluate the electric quadrupole moments of the 1S0 and 3P0 clock states of 27Al+ and 115In+. To capture all dominant contributions, our analysis extends through third order of perturbation theory and includes hyperfine coupling of the electrons to both

Engineering three-body interaction and Pfaffian states in circuit QED systems

August 18, 2014
Author(s)
Mohammad Hafezi, Prabin Adhikari, Jacob M. Taylor
We demonstrate a scheme to engineer the three-body interaction in circuit-QED systems by tuning a fluxonium qubit. Connecting such qubits in a square lattice and controlling the tunneling dynamics, in the form of a synthesized magnetic field, for the

Parametric pumping of precession modes in ferromagnetic nanodisks

March 26, 2014
Author(s)
Feng Guo, Lyubov Belova, Robert McMichael
We report parametric excitation of magnetic precession modes in nanodisks using a parallel pumping configuration. The excitations are detected using a ferromagneitc resonance force microscopy method, and the parallel-pumped spectra reveal nonlinear

Shifts of optical frequency references based on spectral hole burning in Eu3+:Y2SiO5

March 6, 2013
Author(s)
David R. Leibrandt, Michael J. Thorpe, Till P. Rosenband
Spectral hole burning laser frequency stabilization in Eu3+:Y2SiO5 is performed in a cryogenic environment with high temperature stability and low levels of vibration. Several properties of Eu3+:Y2SiO5 spectral holes are measured, including magnetic field

Observation of Collective Atomic Recoil Motion in a Degenerate Fermion Gas

May 23, 2011
Author(s)
Lu Deng, Edward W. Hagley
We demonstrate collective atomic recoil motion with a dilute, ultracold, degenerate fermion gas in a single spin state. By utilizing an adiabatically decompressed magnetic trap with an aspect ratio different from that of the initial trap, a momentum

Number Fluctuations and Energy Dissipation in Sodium Spinor Condensates

June 5, 2009
Author(s)
Yingmei Liu, Eduardo N. Gomez, Stephen E. Maxwell, Lincoln D. Turner, Eite Tiesinga, Paul D. Lett
We characterize fluctuations in atom number and spin populations in F = 1 sodium spinor condensates. The time evolution of the population fluctuations shows a maximum. We interpret this as evidence of a dissipation-driven separatrix crossing in phase space

Characterization of a Metafilm/Metasurface

June 1, 2009
Author(s)
Christopher L. Holloway, Andrew M. Dienstfrey, Edward E. Kuester
A metafilm (also referred to as a metasurface) is the surface equivalent of a metamaterial. More precisely, a metafilm is a surface distribution of suitably chosen electrically-small scatterers. Metafilms are becoming popular as an alternative to full

Application of the Josephson Effect to Metrology

October 1, 2004
Author(s)
Samuel P. Benz, Clark Hamilton
The unique ability of a Josephson junction to control the flow of magnetic flux quanta leads to a perfect relationship between frequency and voltage. Over the last 30 years, metrology laboratories have used this effect to greatly improve the accuracy of dc

Characterization and Reduction of Unexplained Noise in Superconducting Transition-Edge Sensors

May 7, 2004
Author(s)
Joel N. Ullom, William B. Doriese, Gene C. Hilton, James A. Beall, Steven Deiker, William Duncan, S. L. Ferreira, Kent D. Irwin, Carl D. Reintsema, Leila R. Vale
The noise in superconducting Transition-Edge Sensors (TESs) commonly exceeds simple theoretical predictions. The reason for this discrepancy is presently unexplained. We have measured the amplitude and frequency dependence of the noise in TES sensors with

Quantitative Synthetic Polymer Mass Spectrometry Workshop

February 1, 2003
Author(s)
William E. Wallace, Charles M. Guttman, S D. Hanton
Mass spectrometry is a rapidly evolving measurement technique for synthetic polymers. It holds the promise of providing not only absolute molecular mass distributions but also quantitative end-group and repeat-unit composition, and structural information

Improved Characterization of Elastic Scattering Near a Feshbach Resonance in 85 Rb

July 1, 2001
Author(s)
J L. Roberts, N R. Claussen, S L. Cornish, E A. Donley, C E. Wieman
We report extensions and corrections to the measurement of the Feshbach resonance in 85Rb cold atom collisions reported earlier (J.L. Roberts et al., Phys. Rev. Lett. 81, 5109 (1998)). In addition to a better determination of the position of the resonance

Ceramic Thin Film Measurements and Standards Program Web Page

February 1, 2001
Author(s)
Charles E. Bouldin, Debra Kaiser, Peter K. Schenck
Ceramic materials are increasingly being used in thin film form in electronic, optical, optoelectronic, and magnetic devices. Our program addresses measurements, standards and data needs for a wide variety of application areas, including III-V andIII

Excited States at Surfaces: Fano Profiles in STM Spectroscopy of Adsorbates

March 1, 2000
Author(s)
John William Gadzuk, M Plihal
The Fano-Anderson model for a discrete state embedded within a continuum is revisited within the context of excitation and decay processes which lead to some manifestations of Fano lineshape profiles. The phenomenon of resonance tunneling between an STM

Polarized Light Emission from the Metal-Metal STM Junction

January 1, 1998
Author(s)
Daniel T. Pierce, Angela Davies, Joseph A. Stroscio, Robert Celotta
The polarization of light emitted during inelastic tunneling of electrons into both Au(111) and Fe(001) using W(111) tips in an STM junction has been fully characterized by measuring the Stokes parameters. The emitted light for both Au(111) and Fe(001) is

Domain effects in Faraday effect sensors based on iron garnets

February 1, 1995
Author(s)
M. N. Deeter
Domain-induced diffraction effects produced by two iron garnet thick films and two bulk crystals are compared. The thick films, characterized by a serpentine magnetic domain structure, produced nonlinear response functions; this is in qualitative agreement

A reassessment of the Al-Fe system using a four sublattice model for the DO 3 ordering

April 9, 2009
Author(s)
Ursula R. Kattner, Bo Sundman, Ikuo Ohnuma, Nathalie Dupin, S Fries
The Al-Fe system is important in many alloys and the new interest in iron aluminides makes it necessary to improve the modelling of the different ordered forms of the A2 lattice in this system. This has now been done using a 4 sublattice model based o the
Displaying 2576 - 2600 of 3361
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