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Atomic is an educational resource for learning science, history, language, geography, or general knowledge.
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pa.uky.edu
Atomic Data for Astrophysics is a resource that provides atomic data for astrophysics research. It covers topics including photoionization, recombination, collisional ionization and autoionization, charge transfer, Auger processes, energy levels, transition probabilities, collision strengths, and Stark broadening. It also offers related Fortran subroutines and links to other atomic and plasma physics databases.
linelist.pa.uky.edu
A compilation of approximately 923,000 allowed, intercombination and forbidden atomic transitions with wavelengths from 0.5 Å to 1000 µm. Wavelengths are calculated from energy-level differences rather than observed values. Its primary intention is to allow identification of observed atomic absorption or emission features, using a selection tool that applies wavelength and other criteria. Most energy level data come from the NIST Atomic Spectra Database.
camdb.ac.cn
The Atomic & Molecular Database at the Institute of Applied Physics and Computational Mathematics collects, assesses and compiles atomic and molecular data for elementary processes, particularly data used in plasma simulation and diagnosis. It holds more than 2.7 million records and includes an ionization potentials and levels index and a periodic table selector. The molecular database is under construction.
atomic.chat
Atomic Chat is an open-source local AI chat client that runs Gemma, Qwen, DeepSeek and other AI models on the user's device. It offers desktop downloads for macOS, Windows and Linux and mobile apps for iOS and Android, and states that data stays on the device without a cloud account or subscription.
physics.nist.gov
A NIST bibliographic database that contains references to publications including numerical data, general information, comments and reviews on atomic line broadening and shifts. It is part of the collection of the NIST Atomic Spectroscopy Group.
chiantidatabase.org
CHIANTI is an atomic database for spectroscopic diagnostics of astrophysical plasmas, combining a critically evaluated set of up-to-date atomic data with programs in Interactive Data Language (IDL) and Python to calculate plasma spectra. The package is freely available, with a request to appropriately acknowledge CHIANTI when used.
graphoverflow.com
A 3D visualization of the periodic table with a table view shown initially and an atomic view reached by clicking each element. The atomic view uses a 2D Bohr model representation with electrons rotating in a plane.
NIST Standard Reference Database 108 is a handbook of basic atomic spectroscopic data, compiling data for neutral and singly-ionized atoms of elements hydrogen through einsteinium. Wavelengths, intensities and spectrum assignments are given in tables per element, with about 12,000 lines collected in a wavelength-sorted finding list.
lweb.cfa.harvard.edu
The R. L. Kurucz atomic linelist is hosted among databases maintained at the CfA. The source describes it as data from Kurucz CD-ROM 18 and 23, with links to CD-ROM 23, the CfA AMP Server and CD-ROM 18. Other Kurucz data are maintained separately by R. L. Kurucz.
webelements.com
WebElements presents the periodic table of the elements. The table arranges the chemical elements by atomic number so that periodic properties are made clear, and each entry gives the element's symbol, atomic weight and name.
classics.mit.edu
The Internet Classics Archive provides 441 works of classical literature by 59 different authors, mainly Greco-Roman works with some Chinese and Persian, all in English translation. It has operated since 1994 and is run by Daniel C. Stevenson, Web Atomics. A copy was taken over by MIT IS&T after the classics.mit.edu site stopped responding. The site states that all works are, to its knowledge, in the public domain.
github.com
amux is an open-source control plane for AI coding agents, hosted on GitHub by mixpeek. It enables management of parallel AI coding workers including Claude Code, Codex, and Gemini, with features such as a shared task board, atomic task assignment, scheduling, origin-stamped messaging, model switching, self-healing recovery, and access via a dashboard or mobile interface. It is MIT licensed and distributed as a single Rust binary.
atomcentral.com
AtomCentral is dedicated to the restoration and preservation of US Atomic and Nuclear Test footage. It is a division of VCE Films and offers footage and productions content along with licensing.
atomdb.org
AtomDB is an astrophysical plasma emission database providing atomic data for modeling X-ray spectra. It includes ionization and recombination rates, energy levels, wavelength and Einstein A values, electron and proton collision data, and density-sensitive line diagnostics for plasma modeling.
atom.curtin.edu.au
CCC Data Base is a database of convergent close-coupling cross-section data for atomic targets, created by Yuri Ralchenko and Igor Bray. It lists electron-impact data for several elements and ions, positron-impact data for several targets including H-like ions, and proton-impact data for helium. Molecular targets are directed to a separate site.
chemguide.co.uk
chemguide is a site aimed at helping advanced level chemistry students understand chemistry. Its menu covers atomic structure and bonding, inorganic chemistry, physical chemistry, instrumental analysis, basic organic chemistry, organic reaction mechanisms, chemistry calculations and textbook suggestions. A section for 14 to 16 year old students on courses such as GCSE is still being written.
ornl.gov
Dataset repository covering chemistry, with searchable datasets.
hbni.ac.in
The Homi Bhabha National Institute is an Indian deemed university established by the Department of Atomic Energy. It offers Master's and Ph.D. degree programs in engineering, physical, chemical, mathematical, life and medical and health sciences, and lists multiple campuses. Online applications are invited for a Ph.D. programme commencing January 2027, with a last date of 31 October 2026.
aphysics2.lanl.gov
Searchable repository for finding condensed matter physics datasets and datasets.
lammps.org
LAMMPS is a classical molecular dynamics simulator focused on materials modeling, distributed as open source under GPLv2. It provides potentials for solid-state materials and soft matter, and can model atoms or act as a parallel particle simulator at atomic, meso or continuum scale. It runs on single processors or in parallel using message-passing techniques, with some models accelerated on CPUs and GPUs.
lenoverelab.org
The Ligand-Gated Ion Channel Database holds nucleic and proteic sequences of ligand-gated ion channel subunits, one entry per gene, manually constructed and checked. It offers multiple sequence alignments, some phylogenetic studies, and atomic coordinates when available. Development began in 1994 and the resource is now officially frozen; the data and links remain but it is not actively maintained or considered up to date.
nlte.nist.gov
The MCHF/MCDHF Database is a NIST collection of transition data from relativistic theories computed by different computational methods. The Landé gJ factor is provided for a few collections. Data is accessed by selecting an element from the periodic table, then a spectrum, a reference number, and a property. Atomic structure codes used in the calculations, including HFFortran95, ATSP, ATSP2K and GRASP2K, are available for download.
open.adas.ac.uk
OPEN-ADAS is a system for searching and distributing key data from the Atomic Data and Analysis Structure (ADAS), a computer program managed by the University of Strathclyde. It allows non-members interested in fusion and astrophysics to download and use ADAS data. The service supports searches by freeform text, wavelength and ion, and covers numerous data formats.