U.S. flag

An official website of the United States government

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure .gov websites use HTTPS
A lock ( ) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.

Search Publications

NIST Authors in Bold

Displaying 49526 - 49550 of 74175

Creation of an Ultracold Neutral Plasma

December 1, 1999
Author(s)
T C. Killian, S Kulin, S D. Bergeson, Luis A. Orozco, C R. Orzel, S L. Rolston
We report the creation of an ultracold neutral plasma by photoionization of laser-cooled xenon atoms. The charge carrier density is as high as 2 x 10 9 cm -3, and the temperatures of electrons and ions are as low as 100 mK and10 K, respectively. Plasma

Cyclic Fatigue of Intrinsically Brittle Ceramics in Contact with Spheres

December 1, 1999
Author(s)
D K. Kim, Yeon-Gil G. Jung, I M. Peterson, Brian R. Lawn
Contact damage modes in cyclic loading with spheres are investigated in three relatively brittle ceramics, soda-lime glass, porcelain and fine-grain silicon nitride, in moist environments. Initial damage at small numbers of cycles and low loads consists of

Deterioration of Iowa Highway Concrete Pavements: A Petrographic Study

December 1, 1999
Author(s)
Paul E. Stutzman
Major highway concrete pavements in Iowa have exhibited premature deterioration attributed to effects of ettringite formation, alkali-silica expansive reactions, and to frost attack, or some combination of them. These pavements were constructed in the mid

Determination of the Scattering Lengths of 39 K from 1 u Photoassociation Lineshapes

December 1, 1999
Author(s)
Carl J. Williams, Eite Tiesinga, Paul S. Julienne, H Wang, W C. Stwalley, P L. Gould
We report threshold scattering properties for 39K(f = 1) atoms obtained from analysis of experimental photoassociation spectra of the purely long-range 39K 21 u state. The existence of hyperfine structure in the excited K 2 1 u state and a knowledge of the

Domain-Engineered Pyroelectric Radiometer

December 1, 1999
Author(s)
John H. Lehman, George P. Eppeldauer, J A. Aust, M. Racz
We built a large-area domain-engineered pyroelectric radiometer with high spatial and spectral response uniformity that is an excellent primary transfer standard for measurements in the near- and the mid-infrared wavelength regions.

Electrical Control of the Spatial Uniformity of Reactive Species in Plasmas

December 1, 1999
Author(s)
Mark A. Sobolewski, Kristen L. Steffens
We report a new method for controlling the spatial distribution of reactive chemical species in a parallel-plate reactor, by means of a variable-impedance load placed between the unpowered electrode and ground. The technique was demonstrated in 89% CF(sub4

Energy Dispersive X-Ray Spectrometry With the Transition Edge Sensor Microcalorimeter: A Revolutionary Advance in Materials Microanalysis

December 1, 1999
Author(s)
Dale E. Newbury, David A. Wollman, Kent D. Irwin, Gene C. Hilton, John M. Martinis
The NIST microcalorimeter energy dispersive x-ray spectrometer provides important advances in x-ray spectrometry. The high spectral resolution, approaching 2 eV for photon energies below 2 keV, the wide photon energy coverage, 250 eV to 10 keV, and the
Displaying 49526 - 49550 of 74175
Was this page helpful?