Numerical and bibliographical Databases in Atomic and Molecular Physics are essential for both the modelling of various astrophysical media and the interpretation of astrophysical spectra provided by
ground or space-based telescopes. We will present the current status of a numerical and bibliographical database concerning collisional ro-vibrational excitation rate coefficients of molecules. This is part of a EU effort towards the scientific preparation of the HIFI instrument of the Herschel Space Observatory (HSO) [1] and ALMA [2]. We have constituted a international working group of molecular physicists involved in the calculations of ro-vibrational cross-sections, in order to ensure the continuity and the quality of the database. We are primarily focusing on collisional systems of interest for various astrophysical media. The database is composed of several parts : a bibliographic database (papers are read and associated to very precise keywords), calculated collisional rates or cross-sections, information on the molecular data used in the cross section calculations, various information on ro-vibrational excitation of molecules. For the systems of astrophysical interest, we will provide full information on the chain of errors of the data and give some recommendations. We will improve and enlarge the content of the bibliographic database and provide more collisional rates. Access is currently available via a classical WEB interface with an interactive query page for the bibliographic and numerical database. We are also addressing the issue of compatibility of the output of the database within the framework of the Virtual Observatories [3], in relation both with WEB tools for spectral analysis and with other databases [4,5].

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