Search CHIANTI, an atomic database for spectroscopic diagnostics of astrophysical plasmas.
ATOMDB
Explore ATOMDB's astrophysics data resources, including spectra, plasma diagnostics, and database files.
About ATOMDB
ATOMDB provides atomic data and models for astrophysical plasmas, including spectra, plasma diagnostics, and database files. It covers bremsstrahlung, radiative recombination, dielectronic recombination, ionization balance, and calculation of line emission.
The site offers online spectra plotting, density diagnostics and spectrum calculation tools, APED database files for download, and comparisons with models such as Raymond-Smith and MeKaL/SPEX. It also lists workshops, publications, and tools including PyAtomDB and IDL routines.
Key features
- Online tool for plotting AtomDB spectra
- Density diagnostics for plasma analysis
- Spectrum calculation tools
- Downloadable APED database and emissivity files
- Comparisons with Raymond-Smith and MeKaL/SPEX models
- Reference material on ionization balance and line emission
Best for: Researchers and students analyzing X-ray spectra from hot astrophysical plasmas.
Good for
- Offers both online spectra tools and downloadable database files
- Includes model comparisons and Lorentz benchmarks
- Maintained with bugfix releases and updated emissivity files
Watch out for
- Documentation for version 3.1.0 was still being prepared at release announcement
- APEC model has known interpolation issues varying by plasma and instrument
ATOMDB at a glance
- Website
- atomdb.org
- Category
- Research & Data › Open Data & Datasets
- Type
- Website
- Pricing
- Not confirmed. Check the site
- Platforms
- iOS, Web
- Open source
- Not stated
- Last checked
- Oct 5, 2026 · Online when checked
- Listed
- Oct 5, 2026
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ATOMDB FAQ
How do I obtain AtomDB database files?
They are available from the download page or with PyAtomDB.
What changed in the September 2025 emissivity file update?
Oscillator strengths were added as an additional column; no other data changed and spectra using existing models are unaffected.
What did AtomDB 3.1.3 fix?
An issue with the equilibrium apec model files that could trigger in high-temperature 8 keV plasma.
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