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 2976 - 3000 of 4637

Ranging Atom Probe Spectra to Reduce Measurement Bias

July 24, 2024
Author(s)
Frederick Meisenkothen, David Newton, Karen DeRocher, Mark McLean
… attribute regions of interest in the spectrum to specific ion species (i.e., ion ranging). Ion ranging is thus an active area of research within the …

Exponential scaling of clock stability with atom number

March 28, 2015
Author(s)
Till P. Rosenband, David R. Leibrandt
In trapped-atom clocks, the primary source of decoherence is often the phase noise of the oscillator. In this case, it is theoretically possible to derive exponential performance gains by combining several atomic ensembles. For example, M ensembles of N

High-Accuracy Measurement of Atomic Polarizability in an Optical Lattice Clock

April 13, 2012
Author(s)
Jeffrey A. Sherman, Nathan D. Lemke, Nathan M. Hinkley, M. Pizzocaro, Richard W. Fox, Andrew D. Ludlow, Christopher W. Oates
Presently, the Stark effect contributes the largest source of uncertainty in a ytterbium optical atomic clock through blackbody radiation. By employing an ultracold, trapped atomic ensemble and high stability optical clock, we characterize the quadratic

Tracking down sources of carbon contamination in EUVL exposure tools

August 3, 2009
Author(s)
Charles S. Tarrio, Robert E. Vest, Thomas B. Lucatorto, R. Caudillo
Optics in EUVL exposure tools are known to suffer reflectivity degradation, mostly from the buildup of carbon. The sources of this carbon have been difficult to identify. Vacuum cleanliness is normally monitored with a residual gas analyzer, but this has

Measurement of the Coherence of a Bose-Einstein Condensate

October 1, 1999
Author(s)
Edward W. Hagley, Lu Deng, M M. Kozuma, M Trippenbach, Y B. Band, M Edwards, M R. Doery, Paul S. Julienne, Kristian Helmerson, S L. Rolston, William D. Phillips
We study the coherence properties of a Bose-Einstein condensates using an interference technique. Two 100 ns optical standing wave pulses are applied to a condensate with a variable time delay between them. Each standing wave phase grating makes small

Part Deflection Measurements of AM-Bench IN718 3D Build Artifacts

October 6, 2023
Author(s)
Maxwell Praniewicz, Jason Fox, Jared Tarr
One of the primary barriers for adoption of additive manufacturing (AM) had been the uncertainty in the performance of AM parts due to residual stresses/strains. The rapid melting and solidification which occurs during AM processes result in high residual

Visualization and Quantification of Forced In-Plane Flow Through Deformable Porous Media

October 12, 2021
Author(s)
H L. Friedman, R A. Johnson, V Gussev, A V. Neimark, D R. Salem, Richard~undefined~undefined~undefined~undefined~undefined Parnas
Fluid flow in liquid molding processes and in other applications involving porous media is often characterized with a permeability tensor and modeled by d'Arcy's law. The permeability is a sensitive function of pore structure which, in deformable materials

A Q-band free-space characterization of carbon nanotube composites

September 19, 2016
Author(s)
Ahmed M. Hassan, Jan Obrzut, Edward Garboczi
We present a free-space measurement technique for non-destructive non-contact electrical and dielectric characterization of nano-carbon composites in the Q-band frequency range of 30 GHz to 50 GHz. The experimental system and error correction model

The spectrum of Fe II

January 1, 2013
Author(s)
Gillian Nave, S Johansson
The spectrum of singly-ionized iron (Fe II) has been recorded using high-resolution Fourier transform and grating spectroscopy over the wavelength range 900 Å to 5.5 μm. The spectra were recorded in high-current continuous and pulsed hollow cathode

STM Studies of Halide Adsorption on CU(100), CU(110) and CU(111)

October 16, 2008
Author(s)
Thomas P. Moffat
The potential dependent adsorption of chloride and bromide on the three low index copper surfaces has been examined with voltammetry and STM. At saturation coverage, ordered halide adlayers are observed on all three surfaces; (square root 2 x square root 2

Micro-Feature Metrology

May 1, 2005
Author(s)
Bala Muralikrishnan, Jack A. Stone Jr., John R. Stoup
This presentation focuses on three aspects of micro-feature metrology novel applications that drive research and commercialization, capabilities and limitations of existing sensors and techniques, and finally a summary of recent research including ongoing
Displaying 2976 - 3000 of 4637
Was this page helpful?