Online
Scientific Databases
AnthroKids - Anthropometric Data of Children
Anthropometric Data of Children displays the results of two studies on anthropometric data of children.
Atlas of the Spectrum of a Platinum/Neon Hollow-Cathode Lamp in the Region 1130-4330 Å
Atlas of the Spectrum of a Platinum/Neon Hollow-Cathode Lamp in the Region 1130-4330 Å contains wavelengths and intensities for about 5600 lines in the region 4330 Å. An atlas plot of the spectrum is given, with the spectral lines marked and their intensities, wavelengths, and classifications listed.
Atomic Reference Data for Electronic Structure Calculations
Atomic Reference Data for Electronic Structure Calculations contains total energies and orbital eigenvalues for the atoms hydrogen through uranium, as computed in several standard variants of density-functional theory.
NIST Atomic Spectra Database (ASD)
This database provides access and search capability for NIST critically evaluated data on atomic energy levels, wavelengths, and transition probabilities that are reasonably up-to-date. The NIST Atomic Energy Levels Data Center and Data Center on Atomic Transition Probabilities and Line Shapes have carried out these critical compilations.
Atomic Spectral Line Broadening Bibliographic Database
Atomic Spectral Line Broadening Bibliographic Database contains approximately 800 recent references, all collected after the last published bibliography (1993). The database contains numerical data, general information, comments, and review articles.
Atomic Transition Probability Bibliographic Database
Atomic Transition Probability Bibliographic Database provides 6,113 references from 1914 through 1999. These papers contain numerical data, comments, and review articles on atomic transition probabilities (oscillator strengths, line strengths, or radiactive lifetimes).
Atomic Weights and Isotopic Compositions
The atomic weights are available for elements 1 through 111, and isotopic compositions or abundances are given when appropriate.
Bibliography of Photon Total Cross Section (Attenuation Coefficient) Measurements
Bibliography of Photon Total Cross Section (Attenuation Coefficient) Measurements includes papers reporting absolute measurements of photon (XUV, x-ray, gamma-ray, bremsstrahlung) total interaction cross sections or attenuation coefficients for the elements and some compounds. They cover the period from 1907 through 1995.
Biological Macromolecule Crystallization Database
The Biological Macromolecule Crystallization Database and NASA Archive for Protein Crystal Growth Data (BMCD) contains the conditions reported for the crystallization of proteins and nucleic acids used in X-ray structure determinations and archives the results of microgravity macromolecule crystallization studies.
Ceramics WebBook
The Ceramics WebBook is an gateway to evaluated data, a guide to data centers and sources and a repository for tools and resources for ceramics.
NIST Chemical Kinetics Database
The NIST Chemical Kinetics Database includes essentially all reported kinetics results for thermal gas-phase chemical reactions. The database contains over 38,000 separate reaction records for over 11,700 distinct reactant pairs. The data have been abstracted from over 12,000 papers with literature coverage through early 2000.
NIST Chemistry WebBook
The NIST Chemistry WebBook contains: Thermochemical data for over 6500 organic and small inorganic compounds; thermochemistry data for over 9800 reactions; IR spectra for over 8700 compounds; mass spectra for over 12,600 compounds; UV/Vis spectra for over 400 compounds; electronic and vibrational spectra for over 4100 compounds; constants of diatomic molecules(spectroscopic data) for over 600 compounds; ion energetics data for over 16,000 compounds; thermophysical property data for 33 fluids.
ChemRate: A Calculational Database for Unimolecular Reaction
ChemRate is a program that contains databases containing experimental results on unimolecular reactions, information pertaining to transition state and the molecular structure necessary for the calculation of high pressure rate constants and thermal functions.
CIS2 Visual Interoperability Testbed
CIS2 Visual Interoperability Testbed translates a CIS2 file (CIMsteel Integrations Standards) of a steel structure into a 3D interactive model in the form of a VRML (Virtual Reality Modeling Language) file. The translator is part of the research in developing a mapping between VRML prototypes and CIS2.
CKMech (Chemical Kinetic Mechanisms)
CKMech is an interactive site for chemical kinetic mechanisms. It was developed to make available data in a report entitled 'Thermochemical and Chemical Kinetic Data for Fluorinated Hydrocarbons.'
NIST Computational Chemistry Comparison and Benchmark Database
The NIST Computational Chemistry Comparison and Benchmark Database is a collection of experimental and ab initio thermochemical properties for a selected set of molecules. The goals are to provide a benchmark set of molecules for the evaluation of ab initio computational methods and allow the comparison between different ab initio computational methods for the prediction of thermochemical properties.
Computer Forensics Tool Testing (CFTT) Project Web Site
The CFTT is designed to provide a measure of assurance in the results of investigations based on automated tools used in computer forensics examinations.
Diatomic Spectral Database
All of the rotational spectral lines observed and reported in the open literature for 121 diatomic molecules have been tabulated. The isotopic molecular species, assigned quantum numbers, observed frequency, estimated measurement uncertainty, and reference are given for each transition reported.
Dictionary of Algorithms and Data Structures
Dictionary of Algorithms and Data Structures is a dictionary of algorithms, algorithmic techniques, data structures, archetypical problems, and related definitions. Some entries have links to further information and implementations.
Electron Interactions with Plasma Processing Gases
Electron Interactions with Plasma Processing Gases data excerpted from recently published articles in the Journal of Physical and Chemical Reference Data (JPCRD). Presented here are collision cross section data and electron transport coefficients for gases, such as CF4 and CHF3, used in the manufacturing of semiconductor devices.
Electron-Impact Ionization Cross Section Database
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.
Elemental Data Index
The Elemental Data Index provides access to the holdings of the NIST Physics Laboratory online data organized by element. It is intended to simplify the process of retrieving online scientific data for a specific element.
Engineering Statistics Handbook
The Engineering Statistics Handbook details numerous methods to help scientists and engineers incorporate statistical methods in their work.
Fire Research Information Services (FRIS)
Fire Research Information Services (FRIS) is a resource for fire protection engineers, scientists, and fire service personnel. It includes FIREDOC which is a complete fire research bibliographic database with 55,000 holdings (published reports, journal articles, conference proceedings, books, and audiovisual items) of FRIS. Each reference has complete bibliographic information.
CODATA Fundamental Physical Constants
This site, developed in the Physics Laboratory at NIST, addresses three topics: fundamental physical constants, the International System of Units (SI), which is the modern metric system, and expressing the uncertainty of measurement results.
Fundamental Physical Constants - International System of Units (SI)
Fundamental Physical Constants - International System of Units (SI) lists important definitions related to the modern metric system of measurement. These 'essentials' are adapted from NIST Special Publications SP 811 and SP 330.
Fundamental Physical Constants - Searchable Bibliography on the Constants
Fundamental Physical Constants - Searchable Bibliography on the Constants contains citations for the most important theoretical and experimental publications relevant to the fundamental constants and closely related precision measurements published since the mid 1980s.
Ground Levels and Ionization Energies for the Neutral Atoms
Data for ground state electron configurations and ionization energies for the neutral atoms (Z = 1-104) including references.
Guide to Available Mathematical Software
The Guide to Available Mathematical Software studies techniques to provide scientists and engineers with improved access to reusable computer software components which are available to them for use in mathematical modeling and statistical analysis. It provides centralized access to such items as abstracts, documentation, and source code of software modules that it catalogs.
Guidelines for Evaluating and Expressing the Uncertainty of NIST Measurement Results
Guidelines for Evaluating and Expressing the Uncertainty of NIST Measurement Results presents a method of evaluating and expressing uncertainty in measurement adapted from NIST Technical Note 1297.
Handbook of Basic Atomic Spectroscopic Data
This handbook provides a selection of the most important and frequently used atomic spectroscopic data. 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 for each element, and the data for the approximately 12,000 lines of all elements are also collected into a single table.
NIST Heat Transmission Properties of Insulating and Building Materials
NIST has accumulated a valuable and comprehensive collection of thermal conductivity data. Version 1.0 of the database includes data for over 2000 measurements, covering several categories of materials including concrete, fiberboard, plastics, thermal insulation, and rubber.
NIST High Temperature Superconducting Materials Database
The NIST High Temperature Superconducting Materials Database (WebHTS) provides evaluated thermal, mechanical, and superconducting property data for oxides and other nonconventional superconductors.
HIV Structural Database
The HIV Protease Structural Database is an archive of experimentally determined 3-D structures of Human Immunodeficiency Virus 1 (HIV-1), Human Immunodeficiency Virus 2 (HIV-2) and Simian Immunodeficiency Virus (SIV) Proteases and their complexes with inhibitors or products of substrate cleavage.
Human Mitochondrial Protein Database
The Human Mitochondrial Protein Database (HMPDb) provides comprehensive data on mitochondrial and human nuclear encoded proteins involved in mitochondrial biogenesis and function. This database consolidates information from SwissProt, LocusLink, Protein Data Bank (PDB), GenBank, Genome Database (GDB), Online Mendelian Inheritance in Man (OMIM), Human Mitochondrial Genome Database (mtDB), MITOMAP, Neuromuscular Disease Center and Human 2-D PAGE Databases. This database is intended as a tool not only to aid in studying the mitochondrion but in studying the associated diseases.
Hydrocarbon Spectral Database
All of the rotational spectral lines observed and reported in the open literature for 91 hydrocarbon molecules have been tabulated. The isotopic molecular species, assigned quantum numbers, observed frequency, estimated measurement uncertainty and reference are given for each transition reported.
NIST Interactive Algorithm for Isotopic CO2 Measurements
NIST Interactive Algorithm for Isotopic CO2 Measurements is a web-based tool for converting carbon dioxide isotope measurements into standardized delta 13-C and delta-18-O values.
International Comparisions Database
The International Comparisons Database (ICDB) serves the U.S. and the Inter-American System of Metrology (SIM) with information based on Appendices B (International Comparisons), C (Calibration and Measurement Capabilities) and D (List of Participating Countries) of the Comité International des Poids et Mesures (CIPM) Mutual Recognition Arrangement (MRA). The official source of the data is The BIPM key comparison database. The ICDB provides access to results of comparisons of measurements and standards organized by the consultative committees of the CIPM and the Regional Metrology Organizations.
NIST Database for the Isotopic Composition of Selected Atmospheric Constituents
The NIST Database for the Isotopic Composition of Selected Atmospheric Constituents contains over a thousand reported measurements of CH3D, 13CH4, and 14CH4 at sources and in tropospheric air. These isotopic data are useful to modelers who quantify the global or regional methane budgets by comparing the isotopic compositions of methane in ambient air with the isotopic compositions of the aggregate of flux-weighted sources.
NIST ITS-90 Thermocouple Database
Web version of Standard Reference Database 60. NIST reference functions and tables of thermocouple electromotive force (emf) versus temperature have been adopted as standards by the American Society for Testing and Materials (ASTM) and the International Electrotechnical Commission (IEC).
MassSpectator Automated Data Analysis Tool
MassSpectator is a mathematical method that locates, and calculates the area beneath, peaks from mass spectra using only reproducible mathematical operations and no user-selected parameters. It makes no assumptions about peak shape and requires no smoothing or preprocessing of the data.
Matrix Market Database
The Matrix Market Database is a visual repository of test data for use in comparative studies of algorithms for numerical linear algebra, featuring nearly 500 sparse matrices from a variety of applications, as well as matrix generation tools and services.
The Official U.S. Time
This site provides the official U.S. time for each time zone.
Phase Diagrams and Computational Thermodynamics - Solder Systems
Phase Diagrams and Computational Thermodynamics - Solder Systems predicts melting temperatures and freezing ranges of lead-free solders which are used to remove lead-containing components from commercial products. This database also shows the effects of non-equilibrium solidification. Also included is a collection of calculated binary and ternary systems that are relevant to solders.
Polycyclic Aromatic Hydrocarbon Structure Index
NIST Special Publication 922, Polycyclic Aromatic Hydrocarbon Structure Index, is presented by the Chemical Science and Technology Laboratory as an aid in the identification of the chemical structures and nomenclature of 660 common (and not so common) polycyclic aromatic hydrocarbons (PAHs). This electronic version of the Structure Index allows users to browse or search to display name(s), chemical structures, Chemical Abstracts Service (CAS) Registry numbers, molecular weights, and molecular descriptors.
Polymer MALDI MS Methods Database
This database consists of methods, taken largely from the peer-review scientific literature, for matrix-assisted laser desorption ionization (MALDI) mass spectrometry on a wide variety of synthetic polymers. These methods have not necessarily been tested by the Standards and Data Subgroup of the Characterization and Measurement Group of the Polymers Division of the National Institute of Standards and Technology (NIST), nor does NIST claim the database to be a comprehensive list of all methods to be found in the literature. This database is provided solely as a resource for the polymer mass spectroscopy community.
NIST Property Data Summaries for Advanced Materials
Property Data Summaries are topical collections of property values derived from surveys of published data. Thermal, mechanical, structural, and chemical properties are included in the collections.
NIST Property Data Summaries for Fracture Toughness
NIST Property Data Summaries for Fracture Toughness provide fracture toughness data on numerous materials.
NIST Property Data Summaries for Oxide Glasses
The NIST Oxide Glasses Collection has property data on borate base glasss, germanate base glasses, phosphate base glasses and silicate base glasses.
Protein
Data Bank (PDB)
( in
collaboration with RCSB )
The single international repository for the processing and distribution
of 3-D macromolecular structure data primarily determined experimentally
by X-ray crystallography and NMR.
Radionuclide Half-Life Measurements
Radionuclide Half-Life Measurements presents the half-lives of many radionuclides measured in the Radio Activity Group at NIST. Revised values for the half lives of various 'short-lived' radionuclides arise from improved impurity analysis, incorporation of additional data from new sources, and reevaluation of old data.
NIST Recommended Rest Frequencies for Observed Interstellar Molecular Microwave Transitions - 2002 Revision
Critically evaluated transition frequencies for the molecular transitions detected in interstellar and circumstellar clouds are presented.
NIST Database on Reinforcement Permeability Values
This database serves as a repository for permeability measurements. The NIST Database on Reinforcement Permeability Values supports the design and implementation of liquid composite molding (LCM).
Short Tandem Repeat DNA Internet Database
Short Tandem Repeat DNA Internet Database is intended to benefit research and application of short tandem repeat DNA markers for human identity testing. Facts and sequence information on each STR system, population data, commonly used multiplex STR systems, PCR primers and conditions, and a review of various technologies for analysis of STR alleles have been included.
Database for Solder Properties with Emphasis on New Lead-free Solders
This site provides solder properties emphasizing new lead-free solders.
IUPAC-NIST Solubility
Database
These solubilities
are compiled from 15 volumes of the International Union for Pure and
Applied Chemistry (IUPAC)- NIST Solubility Data Series. Typical solvents
and solutes include water, seawater, heavy water, inorganic compounds,
and a variety of organic compounds such as hydrocarbons, halogenated
hydrocarbons, alcohols, acids, esters and nitrogen compounds. There
are over 55,000 solubility measurements and over 1300 references.
NDRL/NIST Solution Kinetics Database on the Web
Data for free radical processes involving primary radicals from water, inorganic radicals and carbon-centered radicals in solution, and singlet oxygen and organic peroxyl radicals in various solvents.
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. These tables provide data of interest for the Emission Line Project in support of analyses of astronomical data from the Chandra X-Ray Observatory.
Statistical Reference Datasets
The Statistical Reference Datasets is also supported by the Standard Reference Data Program. The purpose of this project is to improve the accuracy of statistical software by providing reference datasets with certified computational results that enable the objective evaluation of statistical software.
Stopping-Power and Range Tables for Electrons, Protons, and Helium Ions
The databases ESTAR, PSTAR, and ASTAR calculate stopping-power and range tables for electrons, protons, or helium ions. Stopping-power and range tables can be calculated for electrons in any user-specified material and for protons and helium ions in 74 materials.
NIST Structural Ceramics Database
The NIST Structural Ceramics Database (WebSCD) provides evaluated materials property data for a wide range of advanced ceramics known variously as structural ceramics, engineering ceramics, and fine ceramics.
Synthetic Polymer Mass Spectrometry Project
The Synthetic Polymer Mass Spectrometry Project details the MALDI technique which uses laser light to ablate entire, unfragmented polymer molecules, mixed with an organic acid matrix, from a target surface into a time-of-flight mass spectrometer.
Tables of X-Ray Mass Attenuation Coefficients and Mass Energy - Absorption Coefficients
Tables of X-Ray Mass Attenuation Coefficients and Mass Energy - Absorption Coefficients from 1 keV to 20 MeV for Elements Z = 1 to 92 and 48 Additional Substances of Dosimetric Interest include tables covering energies of the photon (x-ray, gamma ray, bremsstrahlung) from 1 keV to 20 MeV.
Thermodynamics of Enzyme-Catalyzed Reactions Database
The Thermodynamics of Enzyme-Catalyzed Reactions Database contains thermodynamic data on enzyme-catalyzed reactions that have been recently published in the Journal of Physical and Chemical Reference Data (JPCRD). For each reaction the following information is provided: the reference for the data, the reaction studied, the name of the enzyme used and its Enzyme Commission number, the method of measurement, the data and an evaluation thereof.
Database of the Thermophysical Properties of Gases Used in the Semiconductor Industry
The Database of the Thermophysical Properties of Gases Used in the Semiconductor Industry contains transport and thermodynamic property data for the gases used in semiconductor processing. The data are useful for equipment modeling in chemical vapor deposition (CVD) processes and the data will also provide a rational basis for the calibration of mass flow controllers (MRCs) used to meter process gases.
Triatomic Spectral Database
All of the rotational spectral lines observed and reported in the open literature for 55 triatomic molecules have been tabulated. The isotopic molecular species, assigned quantum numbers, observed frequency, estimated measurement uncertainty and reference are given for each transition reported.
Vibrational branching ratios and asymmetry parameters in the photoionization of CO2 in the region between 650 Å and 840 Å
CO2 is studied using dispersed synchrotron radiation in the 650 Å to 850 Å spectral region. The vibrationally resolved photoelectron spectra are analyzed to generate relative vibrational transition amplitudes and the angular asymmetry parameters describing the various transitions observed.
NIST Visible Cement Dataset
The NIST Visible Cement Dataset consists of data on cement pastes with w/c ratios between 0.3 and 0.45 that were prepared and viewed after various hydration times.
Wavenumber Calibration Tables from Heterodyne Frequency Measurements
Wavenumber Calibration Tables from Heterodyne Frequency Measurements contains the bibliography and atlas as updated through November 1994. The atlas and wavenumber tables consist of many pages of spectral maps accompanied by tables of transition wavenumbers and their identity.
X-Ray Attenuation and Absorption for Materials of Dosimetric Interest
Tables and graphs of the photon mass attenuation coefficient and the mass energy-absorption coefficient are presented for all of the elements Z = 1 to 92, and for 48 compounds and mixtures of radiological interest. The tables cover energies of the photon (x-ray, gamma ray, bremsstrahlung) from 1 keV to 20 MeV.
X-Ray Form Factor, Attenuation and Scattering Tables
This database collects tables and graphs of the form factors, the photoabsorption cross section, and the total attenuation coefficient for any element (Z <= 92).
NIST X-ray Photoelectron Spectroscopy Database
The NIST XPS Database gives access to energies of many photoelectron and Auger-electron spectral lines. The database contains over 19,000 line positions, chemical shifts, doublet splittings, and energy separations of photoelectron and Auger-electron lines.
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 data base: (1) a serious attempt to have all experimental values on a scale consistent with the International System of measurement (the SI) and (2) inclusion of accurate theoretical estimates for all transitions.
XCOM: Photon Cross Sections Database
A web database is provided which can be used to calculate photon cross sections for scattering, photoelectric absorption and pair production, as well as total attenuation coefficients, for any element, compound or mixture (Z <= 100) at energies from 1 keV to 100 GeV.
