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Displaying 2951 - 2975 of 3362

Photoassociation Spectroscopy of the Lowest Triplet Potential of Na 2

February 1, 2004
Author(s)
R Dumke, M Johanning, J D. Weinstein, Paul D. Lett
We have performed a type of Autler-Townes spectroscopy to investigate the level structure of the triplet ground state potential of the sodium dimer. By driving photoassociation transitions with continuous-wave lasers, we state-selectively form excited

Dynamics in a Two-Level Atom Magneto-Optical Trap

July 1, 2002
Author(s)
X Xu, T Loftus, M J. Smith, John L. Hall, Alan Gallagher, Jun Ye
Alkaline earth metal atoms present an ideal platform for exploring magneto-optic trap (MOT) dynamics, enabling unique and definitive tests of laser cooling and trapping mechanisms. We have measured the trapping beam intensity, detuning, magnetic-field

Specular Electron Scattering in Metallic Thin Films

May 1, 1999
Author(s)
William F. Egelhoff Jr., P J. Chen, Cedric J. Powell, D Parks, F Serpa, Robert McMichael, D Martien, A. E. Berkowitz
Specular electron scattering at the surface of metallic thin films is an important phenomenon for a class of magnetic multilayers known as giant magnetoresistance (GMR) spin valves. In the very best GMR spin valves, a significant part of the GMR effect is

Materials Reliability 1998 Programs and Accomplishments

January 1, 1999
Author(s)
H I. McHenry, Thomas A. Siewert
The Materials Reliability Division develops measurement technologies which enable the producers and users of materials to improve the quality and reliability of their products. Measurement technologies are developed for process control to improve the

Low-temperature Growth of GMR Spin Valves

January 1, 1996
Author(s)
William F. Egelhoff Jr., R Misra, T Ha, Y Kadmon, Cedric J. Powell, Mark D. Stiles, Robert McMichael, Lawrence H. Bennett, C Lin, J Sivertsen, J Judy
We have investigated the dependence of the giant magnetoresistance (GMR) effect, the coercivity, the coupling field, and the resistivity on film deposition at low-substrate temperatures (150 K) in spin valve multilayers of the general type: FeMn/Ni 80Fe 20

The Development of a Calibrated Atomic Force Microscope

January 1, 1994
Author(s)
T Mcwaid, J Schneir
Advances in the manufacture of integrated circuits, x-ray optics, magnetic read-write heads, optical data storage media, razor blades, etc. require advances in ultraprecision metrology. Each of these industries is currently investigating the use of Atomic

Spin Polarized Metastable Atom He De-excitation, Theory

January 1, 1991
Author(s)
David R. Penn, S Apell
Metastable spin-polarized He* atoms incident on a Ni surface undergo deexcitation in a process which yields electron from the Ni. The number produced is observed to depend on the relative spin of teh Ni and the He* atoms. The normalized difference in the

Theory of Spin Polarized Metastable Atom De-excitation Spectroscopy; Ni-He

January 1, 1990
Author(s)
David R. Penn, S Apell
Metastable spin-polarized He* atoms incident on a Ni surface undergo deexcitation in a process which yields electrons from the Ni. The number produced is observed to depend on the relative spin of the Ni and the He * atoms. The normalized difference in the

Magnetic Trapping of Ultracold Neutrons: Prospects for an Improved Measurement of the Neutron Lifetime, ed. by C.R. Gould, G.L. Greene, F. Plasil, and W.M. Snow

January 1, 2001
Author(s)
P R. Huffman, K Coakley, Alan K. Thompson, G L. Yang, Fred E. Wietfeldt, K J. Alvine, C R. Brome, S N. Dzhosyuk, C E. Mattoni, R A. Michniak, D N. McKinsey, L Yang, John M. Doyle, R G. Golub, K Habicht, J. Koch, Steve K. Lamoreaux, M L. Leite, L Maia, A C. Rodrigues, E D. Zanotto
… Magnetic Trapping of Ultracold Neutrons: Prospects for an …

Diesel Surrogate Fuels for Engine Testing and Chemical-Kinetic Modeling: Compositions and Properties

January 7, 2016
Author(s)
Charles J. Mueller, William J. Cannella, J. Timothy Bays, Thomas J. Bruno, Kathy DeFabio, Heather Dettman, Rafal M. Gieleciak, Marcia L. Huber, Chol-Bum Kweon, Steven S. McConnell, William J. Pitz, Matthew A. Ratcliff
The primary objectives of this work were to formulate, blend, and characterize a set of four ultra-low-sulfur diesel surrogate fuels in quantities sufficient to enable their study in single-cylinder engines and combustion-vessel experiments. The surrogate

High-Stability Single-Ion Clock with 5.5 x 10^-19 Systematic Uncertainty

July 14, 2025
Author(s)
Mason Marshall, Daniel Rodriguez Castillo, Willa Dworschack, Alexander Aeppli, Kyungtae Kim, Dahyeon Lee, William Warfield, Nicholas Nardelli, Tara Fortier, Jun Ye, David Ray Leibrandt, David Hume
We report a single-ion optical atomic clock with fractional frequency uncertainty of 5.5 x 10^-19 and frequency stability of 3.5 x 10^-16/sqrttau/s}, based on quantum logic spectroscopy of a single 27Al+ ion. A co-trapped 25Mg+ ion provides sympathetic

Symplectic geometry and circuit quantization

April 17, 2023
Author(s)
Andrew Osborne, Trevyn Larson, Sarah Jones, Raymond Simmonds, Andras Gyenis, Andrew Lucas
Circuit quantization is an extraordinarily successful theory that describes the behavior of quantum circuits with high precision. The most widely used approach of circuit quantization relies on introducing a classical Lagrangian whose degrees of freedom

Tuning the Mean-Field Energy in a Fermi Gas of Atoms

October 12, 2021
Author(s)
C A. Regal, Deborah S. Jin
An exotic superfluid phase has been predicted for an ultracold gas of fermionic atoms. Experimenters have cooled these gases into the quantum degenerate regime and explored collisional effects. However, quantum mechanical many-body interaction phenomena

PyLCP: A python package for computing laser cooling physics

September 9, 2021
Author(s)
Stephen Eckel, Daniel Barker, Eric Norrgard, Julia Scherschligt
We present a python object-oriented computer program for simulating various aspects of laser cooling physics. Our software is designed to be both easy to use and adaptable, allowing the user to specify the level structure, magnetic field profile, or the

Graphene Quantum Hall Effect Parallel Resistance Arrays

February 2, 2021
Author(s)
Alireza Panna, I Fan Hu, Mattias Kruskopf, Dinesh K. Patel, Dean G. Jarrett, Chieh-I Liu, Shamith Payagala, Dipanjan Saha, Albert Rigosi, David B. Newell, Chi-Te Liang, Randolph Elmquist
As first recognized in 2010, epitaxial graphene on SiC(0001) provides a platform for quantized Hall resistance (QHR) metrology unmatched by other 2D structures and materials. Here we report graphene parallel QHR arrays, with metrologically precise
Displaying 2951 - 2975 of 3362
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