The Best Handbook of Basic Atomic Spectroscopic Data Alternatives in 2026

Search CHIANTI, an atomic database for spectroscopic diagnostics of astrophysical plasmas.

NIST’s Atomic Spectral Line Broadening Bibliographic Database provides references about atomic spectral line broadening, from 1889 onward.

NIST’s Digital Library of Mathematical Functions provides reference material on mathematical functions, with indexes, notations, and search.

China’s national reference materials platform shares reference material resources and information on measurement and testing programs.

Germania Sacra documents the institutions of the historic German Church and provides research on archival sources in handbook form.

NCAR's Earth Observing Laboratory supports research on Earth's atmosphere through its observational program.

China’s National Poultry Laboratory Animal Resource Center collects, preserves, breeds, and shares poultry research resources.

The EAWAG Biocatalysis and Biodegradation Database provides microbial reaction and biodegradation pathway information, though it is no longer actively maintained.

Search BRENDA for enzyme information through the database maintained by Leibniz Institute DSMZ.

Browse atomic data on ionization potentials, energy levels, spectra, and particle collisions in CAMDB.

Search atomic target data in the CCC Data Base by element and explore its listed atomic records.

Explore atomic data for astrophysics, including information on photoionization, recombination, and collisional processes.

OPEN-ADAS lets users search atomic data by element, ion, wavelength, or other parameters.

Örebro’s open data page lists reusable information including supplier invoices, air quality measurements, and other public datasets.

Canada’s National Earthquake Database combines raw seismograph data, measurements, and derived parameters from national seismic networks.

Italy’s National Oceanographic Data Centre is the national reference for the UNESCO oceanographic data exchange system.

IERS provides data on Earth rotation, reference systems, and geophysical fluids, with models, standards, and current bulletins.

CARS shares data from the first release of the Close AGN Reference Survey, a spatial survey of active galaxies.

CDMS provides reference data for molecular spectroscopy, with database records and guidance on their content and citation.

The Atomic Line List compiles calculated wavelengths for allowed, intercombination, and forbidden atomic transitions.

Access Atmospheric Radiation Measurement facility data collected through routine operations and scientific field experiments.

GeoSphere Austria's Data Hub provides station measurements, spatial datasets, images, and weather forecasts.

Browse Kurucz atomic line lists alongside links to related astronomy and molecular databases.

EBAS stores and disseminates atmospheric composition measurements produced by national and international monitoring programs and research projects.