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Displaying 1676 - 1700 of 2086

Low-Level (Submicromole) Environmental 14 C Metrology

October 1, 2000
Author(s)
Lloyd A. Currie, J D. Kessler, J V. Marolf, A. P. McNichol, D R. Stuart, J C. Donoghue, D. J. Donahue, William Burr, D Biddulph
Accelerator Mass Spectrometry (AMS) measurements of environmental 14C have been employed during the past decade at the several micromole level (10's of ug carbon), but advanced research in the atmospheric and marine sciences demands still higher

NIST Data Resources for X-Ray Photoelectron Spectroscopy

October 1, 2000
Author(s)
Cedric J. Powell
A short description is given of data resources that are available from the National Institute of Standards and Technology (NIST) for X-Ray Photoelectron Spectroscopy (XPS). NIST currently has three databases available: an XPS Database (SRD 20), an Elastic

Assessment of Sensitivity Advances in Near-Field Raman Spectroscopy

September 1, 2000
Author(s)
Chris A. Michaels, C E. Dentinger, Lee J. Richter, D B. Chase, Richard R. Cavanagh, Stephan J. Stranick
Near-field Raman spectroscopy can be used to obtain images with both chemical specificity and the subwavelength spatial resolution of near-field scanning optical microscopy (NSOM). In the absence of signal intensification factors, such as surface

Color Test Reagents/Kits for Preliminary Identification of Drugs of Abuse

July 1, 2000
Author(s)
Alim A. Fatah
The objective of this standard is to establish minimum requirements for color test reagent/kits to detect drugs. It is applicable to field testing kits that consist of color reagents for the preliminary identification of drugs. It does not apply to kits

Fast Imaging of Hard X-Rays With a Laboratory Microscope

July 1, 2000
Author(s)
A S. Bakulin, S M. Durbin, Terrence J. Jach, J Pedulla
An improved x-ray microscope with a fully electronic CCD detector system has been constructed that allows improved laboratory-based microstructural investigations of materials with hard x-rays. It uses the Kirkpatrick-Baez multilayer mirror design to form

Role of Competitive Interactions in Growth Rate Trends of Subtilsin s88 Crystals

May 1, 2000
Author(s)
D Asthagirl, A Lenhoff, David Travis Gallagher
An orthorhombic crystal form of subtilisin BPN' variant s88 exhibits a systematic variation in growth rates of its three unique faces, resulting in pronounced variations in crystal morphology as a function of the ionic strength. We have sought to explain

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

Raman Intensity Calibration With Glass Luminescence Standards

January 1, 2000
Author(s)
E S. Etz, Wilbur S. Hurst, Steven J. Choquette
This Paper describes the NIST development of standards and procedures for the calibration of the Raman Spectral Intensity. The work is based on the NIST proposal of the use of luminescent glass standards for the transfer of the white light calibration to
Displaying 1676 - 1700 of 2086
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