1. Interstellar molecules 2. Interstellar shocks and chemistry 3. The primordial gas 4. The rotational excitation of molecules 5. The vibrational excitation of linear molecules 6. The excitation of fine structure transitions 7. Radiative transfer in molecular lines 8. Charge transfer processes 9. Electron collisions 10. Photon collisions Appendix 1. The atomic system of units Appendix 2. Reaction rate coefficients Bibliography Index.
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