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View Resource NIST Reference on Constants, Units, and Uncertainty

Created by the National Institute of Standards and Technology, this comprehensive units and measurement website contains fundamental physical constants, the International System of Units (SI), or metric system, and information on uncertainty of measurements, as well as a searchable bibliography of related papers. It provides an online conversion utility for converting between energy units and...

View Resource NIST XCOM: Photon Cross Sections Database

This web program, funded in part by the National Institute of Standards and Technology (U.S.) is used to calculate photon cross sections for scattering, photoelectric absorption and pair production, as well as total attenuation coefficients, in any element, compound or mixture, at energies from 1 keV to 100 GeV. The contents section of the site contains an introduction, database for elements,...

View Resource X-Ray Form Factor, Attenuation, and Scattering Tables

This site, created by C.T. Chantler of the National Institute of Standards and Technology (NIST), gives the interactions of x-rays with isolated atoms, computed within a self-consistent Dirac-Hartree-Fock framework, across the range from 1-10 eV to 400-1000 keV. A reference paper gives information about the computation. A database of results to the calculation can be searched. External...

View Resource Atomic Spectroscopy: A Compendium of Basic Ideas, Notation, Data, and Formulas

Hosted by the National Institute of Standards and Technology (NIST), this article by W. Martin and W. Wiese introduces the basics of atomic structure and spectra. With regard to structure, there is an emphasis on terminology and notation. Topics of discussion include wavelengths, intensities, shapes of spectral lines, and LS coupling. Originally appearing in the Atomic, Molecular, and Optical...

View Resource Stopping-Power and Range Tables for Electrons, Protons, and Helium Ions

A database containing Physical Reference Data is available online from the National Institute of Standards and Technology (NIST) (mentioned in the August 16, 1996 Scout Report for Science & Engineering). Stopping-Power and Range Tables for Electrons, Protons, and Helium Ions, contains "three web databases, ESTAR, PSTAR and ASTAR, which calculate stopping-power and range tables for electrons,...

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