The following is a directory of online resources of atomic and molecular data for plasma applications.


An online, open-access database containing theoretical high-precision spectroscopic parameters and electron/photon interaction with ion parameters for the complex atoms and multicharged ions developed at Vilnius University, Lithuania.

Update status: Continuously updated.

ADAS: Atomic Data and Analysis Structure

The Atomic Data and Analysis Structure (ADAS) is an interconnected set of computer codes and data collections for modelling the radiating properties of ions and atoms in plasmas. Its applications are in plasmas in the interstellar medium, and stellar atmospheres, industrial processes, and experimental thermonuclear fusion devices.

Update status: Continuously updated.

ALADDIN: A Labelled Atomic Data INterface

ALADDIN (A Labelled Atomic Data INterface) is a database of evaluated and recommended atomic, molecular and plasma-surface interaction data for fusion applications maintained by the International Atomic Energy Agency.

Update status: Continuously updated.

AMBDAS: Atomic and Molecular Bibliographic Data System

The Atomic and Molecular Bibliographic Data System (AMBDAS) is a bibliographic database of literature on fundamental atomic and molecular processes for fusion applications maintained by the International Atomic Energy Agency.

Update status: Continuously updated.


A database devoted to collisional ro-vibrational excitation of molecules by colliders including atoms, ions, molecules, and electrons.

Update status: Continuously updated.


Electron interaction cross sections for elastic scattering, electron excitation, ionization and total scattering.

Update status: Continuously updated.

CDMS: Cologne Database for Molecular Spectroscopy

The Cologne Database for Molecular Spectroscopy is a database of microwave spectroscopic data concerning 900+ species in the interstellar medium (ISM) and circumstellar envelopes.

Update status: Continuously updated (2–3 updates per month).

CDSD: Carbon Dioxide Spectral Database

A high-temperature line list for CO2, produced by the V.E. Zuev Institute of Atmospheric Optics, Tomsk Russia, in 2011: S. A. Tashkun and V. I. Perevalov, Journal of Quantitative Spectroscopy and Radiative Transfer 112, 1403 (2011).

Update status: Fixed at the 2011 version, but continues to be available at the IAO FTP site.


An atomic database for spectroscopic diagnostics of astrophysical plasmas. The supporting Python software library, ChiantiPy seems to be actively maintained.

Update status: Last updated: 2015 (version 8.0).

ECaSDa, GeCaSDa, MeCaSDa, RuCaSDa, SHeCaSDa, TFMeCaSDa Calculated Spectroscopic Databases

A suite of “Calculated Spectroscopic Databases (CaSDa)” for the individual molecules: C2H4 (ECaSDa), GeH4 (GeCaSDa), CH4 (MeCaSDa), RuO4 (RuCaSDa), SF6 (SHeCaSDa), CF4 (TFMeCaSDa).

Update status: Updated as new calculations are completed.

ESCS: Electron Scattering Cross Sections at UMK

A database of electron-atom and electron-molecule scattering cross sections maintained by the group of Grzegorz Karwasz at Nicolaus Copernicus University in Toruń (Uniwersytet Mikołaja Kopernika w Toruniu, UMK).

Update status: Continuously updated.


A database of molecular line lists that can be used for spectral characterisation and simulation of exoplanet and cool star atmospheres. Since some line lists in this collection are extremely large (up to 1014 lines), a service to produce absorption cross section data at a user-defined resolution is provided.

Update status: Continuously updated.

GEISA: Gestion et Etude des Informations Spectroscopiques Atmosphériques

Gestion et Etude des Informations Spectroscopiques Atmosphériques: Management and Study of Spectroscopic Information is a A spectroscopic line list database for atmospheric applications with an interactive interface.

Update status: Continuously updated.


The "Grotrian" Electronic Structure of Atoms Information System is a collection of experimental and theoretical data on energy levels and transitions in atoms and ions with an interactive interface maintained by researchers at Novosibirsk State University in Russia.

Update status: Continuously updated.

HITRAN: HIgh-resolution TRANsmission

HITRAN (HIgh-resolution TRANsmission) is a compilation of spectroscopic parameters that a variety of computer codes use to predict and simulate the transmission and emission of light in planetary atmospheres.

Update status: Continuously updated, with major releases every four years.


A database of cross sections for dissociative electron attachment to molecules.

Update status: Apparently no longer updated, but the web service is still useable.

JPL Molecular Spectroscopy Database

A companion database to the CDMS catalogue, this is a compilation of rotational transition frequencies and intensities of molecules of astrophysical interest.

Update status: Continuously updated.

KIDA: The Kinetic Database for Astrochemistry

The Kinetic Database for Astrochemistry is a database of kinetic data of interest for astrochemical (interstellar medium and planetary atmospheres) studies.

Update status: Continuously updated.

LAMDA: Leiden Atomic and Molecular Database

Atomic and molecular spectroscopic line data for a number of astrophysically interesting species, including energy levels, statistical weights, Einstein A-coefficients and collisional rate coefficients.

Update status: Continuously updated.

LXCat: Electron Scattering Catalogue

A database of electron- and ion-scattering cross sections, swarm parameters, reaction rates, energy distribution functions and other data required for modelling low-temperature plasmas initiated in 2010 by researchers at Laboratoire des Plasmas et Conversion d’Energie (LAPLACE), a laboratory operated jointly by the CNRS, the University of Toulouse and the Institut Polytechnique of Toulouse.

Update status: Continuously updated.


A database of photodissociation cross sections with an interactive interface, run by the Institute of Physics Belgrade and Astronomical Observatory Belgrade.

Update status: Continuously updated.

NIFS Databases

A suite of databases of fundamental atomic and molecular data for fusion applications developed and maintained by the Atomic and Molecular Research Center at the National Institute for Fusion Science, Japan.

Update status: Continuously updated.

NIST Atomic Spectra Database (ASD)

A database of radiative transitions and energy levels in atoms and atomic ions managed by the US National Institute of Standards and Technology.

Update status: Continuously updated.

PEARL: Photonic Electronic Atomic Reaction Library

The Photonic Electronic Atomic Reaction Library (PEARL) is a database of photoionization/ electron-impact ionization and dielectronic recombination cross sections and rate coefficients maintaned by the Atomic Data Center of the Korea Atomic Energy Research Institute (KAERI).

Update status: Continuously updated.


A commercial database (with separate licensing terms for academic use) of plasma collisional processes and chemistries for industrial, astrophysical and fusion applications.

Update status: Continuously updated.


A database of spectroscopic properties of atoms and ions, including ionization potentials, energy levels, transition frequencies and intensities, and collisional data). Managed by the Joint Institute for High Temperatures (JIHT) of the Russian Academy of Sciences (RAS) and the All-Russian Scientific Research Institute Of Technical Physics (VNIITF).

Update status: Last updated: since January 2014.

STARK-B: Stark-Broadening

A database for "Stark" broadening of isolated lines of atoms and ions in the impact approximation.

Update status: Last updated: February 2017.


Two databases: TIPbase, containing fine-structure atomic data computed for ions of astrophysical interest; and TOPbase, an online atomic database created as part of the Opacity Project.

Update status: Last updated: although the database itself may not have been updated for some time (2009?), the data service itself continues to run effectively.


The UMIST Database for Astrochemistry contains reaction rate coefficient data for species of astrophysical interest, with a particular emphasis on hydrocarbons and their ions.

Update status: Last updated: 2012.

VALD: Vienna Atomic Line Database

The Vienna Atomic Line Database (VALD) is a collection of atomic and molecular transition parameters of astronomical interest. Now identifying as VALD3, it is provided by mirrored servers in Uppsala, Sweden, Vienna, Austria, and Moscow, Russia.

Update status: Continuously updated.