EELS DB collects electron energy loss spectroscopy and X-ray spectra, with records covering 43 elements.
The Cologne Database for Molecular Spectroscopy
CDMS provides reference data for molecular spectroscopy, with database records and guidance on their content and citation.
About The Cologne Database for Molecular Spectroscopy
The Cologne Database for Molecular Spectroscopy provides reference data for molecular spectroscopy. It lists 1381 entries identified by tag, species name, line count, version, catalog file, documentation, entry date, and wavenumber range in cm–1, with catalogs in HTML and ASCII.
The site includes notes on content and citation, the meaning of asterisks, intensity measures, and partition functions. It states that errors in recent entries cannot be completely ruled out.
Key features
- 1381 entries with species name, line count, and version
- Catalog files in HTML and ASCII formats
- Wavenumber coverage listed in cm-1 per entry
- Separate predictions for selected hyperfine-splitting cases
- Partition function values tied to vibrational ground state
- Entry dates and version numbers for each record
Best for: Researchers using molecular line data for laboratory comparison or radioastronomical observation.
Good for
- Lists 1381 entries with standardized identifiers and line counts
- Offers catalogs in both HTML and ASCII formats
- Explains notation differences, such as Sµ2 versus intensity at 300 K
Watch out for
- Recent entries may contain errors
- Partition function values cover only the vibrational ground state unless stated otherwise
- Some asterisked tags report Sµ2 instead of intensity at 300 K, requiring careful interpretation
The Cologne Database for Molecular Spectroscopy at a glance
- Category
- Research & Data › Open Data & Datasets
- Type
- Website
- Pricing
- Not confirmed. Check the site
- Platforms
- Web
- Open source
- Not stated
- Language
- English
- Last checked
- Oct 5, 2026 · Online when checked
- Listed
- Oct 5, 2026
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The Cologne Database for Molecular Spectroscopy FAQ
What does an asterisk after the version number mean?
It indicates the entry was included after acceptance of the CDMS article in J. Mol. Struct., 742, 215-227 (2005), in January 2005.
What does an asterisk after the tag mean?
It means the record gives temperature-independent Sµ2 instead of intensity I at 300 K.
What do the documented partition function values represent?
They refer to the vibrational ground state only, unless stated otherwise.
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