Abstract: Atomic and molecular data for the transitions of a number of astrophysically interesting species are summarized, including energy levels, statistical weights, Einstein A-coefficients and collisional rate coefficients. Available collisional data from quantum chemical calculations and experiments are extrapolated to higher energies (up to E/k~1000K). These data, which are made publically available through the WWW at http://www.strw.leidenuniv.nl/~moldata , are essential input for non-LTE line radiative transfer programs. An online version of a co...
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