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| Atomic Spectroscopic Data |
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| Atomic Spectra Database |
| This database contains critically evaluated NIST data for radiative
transitions and energy levels in atoms and atomic ions. Data are included
for observed transitions of 99 elements and energy levels of 52 elements.
ASD contains data on about 950 spectra from about 1 Å to
200 µm, with about 70,000 energy levels and 90,000 lines, 40,000
of which have transition probabilities. The most current NIST-evaluated
data associated with each transition are integrated under a single listing.
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|  ASD 3.0 Lines [help] |
| The lines database contains spectral lines and associated energy
levels displayed in wavelength order with all selected spectra
intermixed or in multiplet order. Transision probablities
for the lines are also displayed where availible.
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|  ASD 3.0 Levels [help] |
| The levels database contains energy levels of a particular atom or
ion displayed in order of energy above the ground state.
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|  Handbook of Basic Atomic Spectroscopic Data |
| This handbook is designed to provide a selection of the most important and frequently used atomic spectroscopic data in
an easily accessible format. The compilation includes data for the neutral and singly-ionized atoms of all elements hydrogen
through einsteinium (Z = 1-99). The wavelengths, intensities, and spectrum assignments are given in a table for each
element, and the resulting total of some 12,000 lines for all elements are also collected into a single table, sorted by
wavelength (a "finding list").
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|  Energy Levels of Hydrogen and Deuterium |
| This database provides theoretical values of energy levels of hydrogen and deuterium for principle quantum numbers
n = 1 to 200 and all allowed orbital angular momenta l and total angular momenta j.
The values are based on current knowledge of the revelant theoretical contributions including relativistic, quantum
electrodynamic, recoil, and nuclear size effects. This interactive database allows a user to obtain individual energy
levels and transition frequencies as well as tables of frequencies. Given the volume of the possible data, this Web
site is designed to calculate the values as requested.
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|  Spectral Data for the Chandra X-Ray Observatory |
| Tables of critically compiled wavelengths, energy levels, line classifications, and transition
probabilities are given for ionized spectra of neon (Ne V to Ne VIII), magnesium (Mg V to Mg X),
silicon (Si VI to Si XII), and sulfur (S VIII to S XIV) in the 20 Å to 170 Å region.
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|  X-Ray Transition Energies Database |
| This X-ray transition table provides the energies and wavelengths for the K and L transitions
connecting energy levels having principal quantum numbers n = 1, 2, 3, and 4.
The elements covered include Z = 10, neon to
Z = 100, fermium. There are
two unique features of this database: (1) all experimental values are on
a scale consistent with the International System of measurement (the SI) and
the numerical values are determined using constants from the most recent
Recommended Values of the Fundamental Physical Constants: 1998
and (2) accurate theoretical estimates are included for all transitions.
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|  Spectrum of Platinum |
| An atlas of the spectrum of a platinum/neon hollow-cathode reference
lamp in the region 1130 Å to 4330 Å is given,
with the spectral lines marked and their intensities, wavelengths,
and classifications listed. Graphical figures of the spectrum are
included.
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| Atomic and Molecular Data |
|  Electron-Impact Cross Sections |
| This is a database primarily of total ionization cross sections of
molecules by electron impact. The database also includes cross sections for a
small number of atoms and energy distributions of ejected electrons for H, He,
and H2. The cross sections were calculated using the
Binary-Encounter-Bethe (BEB) model, which combines the Mott cross section with
the high-incident energy behavior of the Bethe cross section. Selected
experimental data are included. Electron-impact excitation cross sections are also included for some selected atoms.
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|  Potential Energy Surface Database of Group II Dimer Molecules |
| The purpose of this work is to provide critical atomic and molecular data needed in order to evaluate the feasibility
of using laser cooled and trapped Group II atomic species (Mg, Ca, Sr, and Ba) for ultra-precise optical clocks or
quantum information processing devices.
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| X-Ray and Gamma Ray Data |
| Please visit the note on
the X-Ray Attenuation Databases.
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|  X-ray Attenuation and Absorption for Materials of Dosimetric Interest |
| Tables and graphs of computed photon mass attenuation coefficients and mass
energy-absorption coefficients from 1 keV to 20 MeV are presented for
all of the elements (Z = 1 to 92) and for 48 compounds and
mixtures of radiological interest. These coefficients are basic quantities used
in calculations of the penetration and the energy deposition by photons (x-ray,
gamma-ray, bremsstrahlung) in biological, shielding, and other materials.
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|  XCOM: Photon Cross Sections Database |
| This database can be 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.
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|  Form Factor, Attenuation, and Scattering Tabulation |
| The primary interactions of x-rays with isolated atoms from
Z = 1 (hydrogen) to Z = 92 (uranium) are
described and computed within a self-consistent Dirac-Hartree-Fock framework.
The results are provided over the energy range from either 1 eV or
10 eV to 433 keV, depending on the atom. Self-consistent values of
the f1 and f2 components of the atomic
scattering factors are tabulated, together with the photoelectric attenuation
coefficient for the atom, µ, and the value for the K-shell,
µK, as functions of energy and wavelength.
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| Radiation Dosimetry Data |
| The databases ESTAR, PSTAR, and ASTAR calculate stopping-power and range tables
for electrons, protons, or helium ions, according to methods described in ICRU
Reports 37 and 49. Stopping-power and range tables can be calculated for electrons
in any user-specified material and for protons and helium ions in 74 materials.
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|  Electrons |
|  Helium Ions |
|  Protons |
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| Nuclear Physics Data |
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|  Radionuclide Half-Life Measurements |
| This database is a table of the half lives of 61 important radionuclides
measured primarily with ionization chambers by the Radioactivity Group of
NIST. The included half lives range from 10 minutes to 60.7 years.
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|  Isotopic Compositions |
| This database contains the isotopic compositions or abundances of those elements
which have characteristic terrestrial compositions.
Atomic weights are also available for elements 1 through 111.
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| Condensed Matter Physics Data |
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|  Atomic Reference Data for Electronic Structure Calculations |
| This database consists of evaluated data for use in total-energy calculations of electronic
structure by density-functional theory. It contains total energies and orbital eigenvalues
for the atoms hydrogen through uranium, as computed in several standard variants
of density-functional theory.
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Information about the Ground-State, Ionization Energy, & Atomic Weight Data |
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Atomic
Weights are based upon 12C.
Brackets [ ] indicate the mass number of the most stable isotope.
Uncertainties are indicated in parentheses following the last significant figure to which they are attributed.
The ground-state and ionization data come from
Ground Levels and Ionization Energies
for the Neutral Atoms. Bibliographic references for the data can be found within the database.
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