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Gaithersburg

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

Structure of the CIFter CD

LEVEL O CD_contents.html: This file Readme.html: Project overview and directions for conducting the evaluation cifterLetter.html: Wayne Gray...

CIFter Overview

Overview of the CIFter project The CIFter Project was created by The National Institute of Standards and Technology ( NIST) to promote the...

NIST-Made ‘Sun and Rain’ Detail How Nanoparticles Can Escape from Plastic Coatings into the Environment

September 30, 2016

If the 1967 film “The Graduate” were remade today, Mr. McGuire’s famous advice to young Benjamin Braddock would probably be updated to “Plastics … with...

WebTools-Readme

What the directory contains: Readme.html: this file WebVIP directory VisVIP directory FLUD directory ///////////////////////////////////////...

JWANDS-Readme

What the directory contains: Readme.html: this file jwands.jar: the JWANDS package /////////////////////////////////////////////////////////...

CIFter Tasks-Readme

What the directory contains: this file -- Readme.html CIFter_Tasks.html -- list of tasks specified by TMF. CIFter_Tasks.doc -- same content...

NIST/CIFter Tasks

NIST/CIFter Tasks (as characterized by TMF) The Motley Fool Audience: USER PROFILE 1: a naive to novice knowledge level investor recently...

VisVIP Readme

What the directory contains: Readme.html -- this file VisVIP.exe -- a self-extracting installation of VisVIP ///////////////////////////////...

Flud-Readme

What the directory contains: Readme.html: this file draft-format.html -- definition of format and its elements /////////////////////////////...

Flud-draft-format

The FLUD format: Logging Usability Data from Web-based Applications John Cugini / cuz [at] nist.gov (cuz[at]nist[dot]gov) Information Technology Laboratory National...

Novel 3-in-1 “Rheo-Raman” Microscope Enables Interconnected Studies of Soft Materials

October 4, 2016

An innovative three-in-one instrument that allows scientists to correlate the flowability of soft “gooey” materials such as gels, molten polymers and biological...

‘Security Fatigue’ Can Cause Computer Users to Feel Hopeless and Act Recklessly, New Study Suggests

October 4, 2016

After updating your password for the umpteenth time, have you resorted to using one you know you’ll remember because you’ve used it before? Have you ever given...

Methane Symmetry Operations - Acknowledgements and References

The author would like to express his appreciation to a number of colleagues, particularly Drs. W.S. Benedict, R.F. Curl, W.J. Lafferty, I.M...

Methane Symmetry Operations - Time-Reversal Hermitian Conjugation

17. The Compound Operation Time-Reversal Hermitian Conjugation It is sometimes convenient, especially when investigating the legitimacy...

Methane Symmetry Operations - Vibration-rotation operators

16.4 Vibration-rotation operators in the transformed Hamiltonian It is common to treat the vibration-rotation problem in methane using...

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