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Gaithersburg

The Changing Competitive Environment: Standards and the Digital Economy/IoT – Implications for Policy and Teaching

July 12, 2016

Date: September 8-9, 2016Location: Gutman Conference Center, Harvard University, Harvard Graduate School of Education, Appian Way and Brattle Street, Cambridge...

New NIST Test Bed Makes the 'Digital Thread' Accessible

October 7, 2016

GAITHERSBURG, MD.—Researchers at the U.S. Commerce Department’s National Institute of Standards and Technology (NIST) celebrated Manufacturing Day today by...

NSCI Seminar: New Directions for Energy-Efficient Computing Systems: From Sensing and Design to Runtime Management

Tue, Jan 17 2017

Power consumption is one of the major barriers towards improving the performance of computing systems. The exa-scale

CIFter Documentation Guide

CIFter CD documentation -- Release date: December 31, 2000 CIFter Release Notes -- 3 notes posted; last notes posted on Feb 16, 2001 CIFter...

CIFter Release Notes

Jan 9, 2001: Missing AcknowledgmentAcknowledgment of Joe Konczal added to ( project overview). Feb 16, 2001: New CDs burned and...

CIFter Literature

References Gray, Wayne D & Marilyn C. Salzman. 1998. Damaged Merchandise? A Review of Experiments That Compare Usability Evaluation Methods...

New Funding for Massachusetts to Serve the State’s Manufacturers

October 6, 2016

As part of a multiyear effort to make the most of its federal investment in U.S. manufacturing, the National Institute of Standards and Technology (NIST) has...

Neutron Imaging Facility (NIF)

Summary The NIST Neutron Imaging Facility provides users with a unique “plug and play” approach to imaging operating fuel cells, electrolyzers, and lithium-ion

‘Built Environment’ Portal Now Part of Climate Resilience Toolkit

October 3, 2016

As part of the ongoing collaborative federal effort to strengthen the resilience of the nation’s cities, towns and other inhabited areas, the Community...

Atomic Spectroscopy - Sources of Spectroscopic Data & References

22. Sources of Spectroscopic Data A fairly comprehensive bibliographic review of compilations of data on atomic energy levels, wavelengths...

Atomic Spectroscopy - Spectral Continuum Radiation

21. Spectral Continuum Radiation Hydrogenic Species Precise quantum-mechanical calculations exist only for hydrogenic species. The total...

Atomic Spectroscopy - Spectral Line Shapes, etc.

20. Spectral Line Shapes, Widths, and Shifts Observed spectral lines are always broadened, partly due to the finite resolution of the...

Atomic Spectroscopy - Atomic Lifetimes

18. Atomic Lifetimes The radiative lifetime τ k of an atomic level k is related to the sum of transition probabilities to all levels i lower...

Atomic Spectroscopy - Transition probabilities of persistent lines

Wavelengths, upper energy levels E k, statistical weights g i and g k of lower and upper levels, and transition probabilities A ki for...

Atomic Spectroscopy - Spectral Lines

17. Spectral Lines: Selection Rules, Intensities, Transition Probabilities, Values, and Line Strengths Selection rules for discrete...

Atomic Spectroscopy - Spectral Wavelength Ranges, Dispersion of Air

15. Spectral Wavelength Ranges, Dispersion of Air The ranges of most interest for optical atomic spectroscopy are: ~ 2 - 20 µm mid-infrared...

Atomic Spectroscopy - Sequences

14. Sequences Several types of sequences of elements and/or ionization stages are useful because of regularities in the progressive values...

Atomic Spectroscopy - Term Series, Quantum Defects

13. Term Series, Quantum Defects, and Spectral-line Series The Bohr energy levels for hydrogen or for a hydrogenic (one-electron) ion are...

Atomic Spectroscopy - Zeeman Effect

12. Zeeman Effect The Zeeman effect for "weak" magnetic fields (the anomalous Zeeman effect) is of special interest because of the...

Atomic Spectroscopy - Eigenvector Composition of Levels

10. Eigenvector Composition of Levels The wave functions of levels are often expressed as eigenvectors that are linear combinations of...

Atomic Spectroscopy - Different Coupling Schemes

9. Notations for Different Coupling Schemes The following examples make clear the meaning of the different coupling-scheme notations. Not...

Atomic Spectroscopy - Allowed Terms

8. Allowed Terms of Levels for Equivalent Electrons LS Coupling The allowed LS terms of a configuration consisting of two...

Atomic Spectroscopy - Helium-like Ions; LS Coupling

6. Helium and Helium-like Ions; LS Coupling The energy structure of the normal 1 snl configurations is dominated by the electron-nucleus and...

Atomic Spectroscopy - Atomic States, Shells, and Configurations

3. Atomic States, Shells, and Configurations A one-electron atomic state is defined by the quantum numbers nlm lm s or nljm j, with n and l...

Atomic Spectroscopy - Introduction

1. Introduction This article outlines the main concepts of atomic structure, with some emphasis on terminology and notation. Atomic...

Atomic Spectroscopy - Version History

Example of how to reference this online database: (Replace year, month day with database access date.) W.C. Martin and W.L. Wiese (2002)...

CNST Welcomes New Deputy Director

October 3, 2016

For James Kushmerick, who became the deputy director of CNST on Oct. 3, joining the Center “feels like I’m getting back to my roots.” In 1994, Kushmerick was...

Grant Summary - 2016

Recipient Title Award Amount American National Standards Institute Secretariat for ISO/IEC JTC 1/SC 37, Biometrics...

Transfer and working standard radiometers and photometers

To decrease the large measurement-uncertainty gap between cryogenic radiometer measurements (such as those made by the NIST Primary optical watt radiometer) and

Detector-based color scale

Until recently calibrations of tristimulus colorimeters were performed against lamp standards. However, the uncertainty of these source-based calibrations

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