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Physics

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Displaying 2426 - 2450 of 2574

Physics Laboratory Technical Activities 2000

February 1, 2001
Author(s)
K B. Gebbie, William R. Ott
This report summarizes research projects, measurement method development, calibration and testing, and data evaluation activities that were carried out during calendar year 2000 in the NIST Physics Laboratory. These activities are in the areas of electron

Relativistic Valence Bond Theory and Its Application to Metastable Xe 2

February 1, 2001
Author(s)
Svetlana A. Kotochigova, Eite Tiesinga, I Tupitsyn
We present a new version of the relativistic configuration interaction valence bond (RCIVB) method. It is designed to perform an ab initio all-electron relativistic electronic structure calculation for diatomic molecules. A nonorthogonal basis set is

A Single 199 Hg + Ion Optical Clock

January 1, 2001
Author(s)
James C. Bergquist, Christopher W. Oates, E A. Curtis, Leo W. Hollberg, Robert E. Drullinger, Wayne M. Itano, David J. Wineland, T Udem

Highly Charged Ions

January 1, 2001
Author(s)
John D. Gillaspy
This article reviews some of the fundamental properties of highly charged ions, the methods of producing them (with particular emphasis on table-top devices), and their use as a tool for both basic science and applied technology. Topics discussed include

Large-Area TKIDs for a New Generation of Neutron Beta Decay Experiments

January 1, 2001
Author(s)
Elizabeth Scott, Jimmy P. Caylor, Maynard S. Dewey, Jiansong Gao, Colin A. Heikes, Shannon Hoogerheide, Hans Pieter Mumm, Jeffrey S. Nico, Joel Ullom, Michael Vissers
Nuclear physics has long played a central role in our efforts to better understand the natural world. Several experiments are well positioned to improve limits in searches for physics Beyond the Standard Model (BSM). Many of the experiments in nuclear

Single-frequency and Mode-locked Er/Yb Co-doped Waveguide Lasers

January 1, 2001
Author(s)
Berton Callicoatt, John B. Schlager, Kevin L. Silverman, Robert K. Hickernell, Richard P. Mirin, Norman A. Sanford, Joseph S. Hayden, Samuel D. Conzone, Robert D. Simpson
We present results for single-frequency and mode-locked Er/Yb co-doped waveguide lasers. The single-frequency DBR waveguide lasers have output power in excess of 80 mW with laser linewidth of 17 kHz. The passively mode-locked waveguide lasers produce

Wavelength standards for optical communications

January 1, 2001
Author(s)
Sarah L. Gilbert, William C. Swann, Tasshi Dennis
We review wavelength accuracy and calibration issues for wavelength division multiplexed (WDM) optical fiber communication and describe our work on wavelength calibration references. We have developed wavelength references for National Institute of

Laboratory Astrophysics Survey of Key X-Ray Diagnostic Lines Using a Microcalorimeter on an Electron Beam Ion Trap

September 1, 2000
Author(s)
E Silver, H. Schnopper, Simon R. Bandler, N Brickhouse, S Murray, M Barbera, E Takacs, John D. Gillaspy, James V. Porto, I Kink, J M. Laming, N. Madden, D Landis, J. Beeman, E. E. Haller
Cosmic plasma conditions created in an Electron Beam Ion Trap (EBIT) make it possible to simulate the dependencies of Key diagnostic x-ray lines on density, temperature, and excitation conditions that exist in astrophysical sources. We used a

Magnetic Depth Profiling Co/Cu Multilayers to Investigate Magnetoresistance

May 1, 2000
Author(s)
John Unguris, D Tulchinsky, Michael H. Kelley, Julie A. Borchers, Joseph A. Dura, Charles F. Majkrzak, S. Y. Hsu, R Loloee, W Pratt, J Bass
The magnetic microstructure responsible for the metastable high resistance state of weakly coupled, as-prepared [Co(6nm)/Cu(6nm)] 20 multilayer was analyzed using polarized neutron reflectivity (PNR) and scanning electron microscopy with polarization

Physics Laboratory Technical Activities 1999

March 1, 2000
Author(s)
K B. Gebbie
This report summarizes research projects, measurement method development, calibration and testing, and data evaluation activities that were carried out during calendar year 1999 in the NIST Physics Laboratory. These activities are in the areas of electron
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