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MOLAT contains original atomic and molecular data and compilations produced independently or during collaborations involving members of Paris Observatory. It includes experimental spectroscopic data (mainly VUV) obtained by the Meudon experimental group using either the 10m high resolution VUV spectrograph of the Observatory or the LURE-Orsay synchrotron facility.

MOLAT also includes theoretical data from different groups of the Observatory concerning atomic or molecular structures, radiative transition probabilities, electron impact excitation cross-sections of Neon-like ions and Stark broadening parameters. Links to other pertinent atomic or molecular databases are also provided.

An effort is underway to give a more unified presentation of these various data. Some of these databases have been processed with use of Virtual Observatory tools. Access to BASECOL and CDMS data via Virtual Observatory tools is described in this presentation. A spectral line access protocol has been set up on the theoretical VUV theoretical H2 data base, allowing to get the relevant information for a given spectral interval on the spectral properties of H2, HD and D2 (wavenumbers, oscillator strengths, term energies of the upper and lower levels, corresponding quantum numbers, and other information).

The Stark-b database is another example that is concerned with Stark broadening of selected isolated lines of atoms and molecules in the impact approximation according to theoretical calculations. Meudon also contributes to the theoretical TIPTOP database, which is stored at the Strasbourg astronomical Data Center (

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