Solar neighbourhood Astrochemistry 1 Atomic hydrogen 1 Binary neutron stars 1 Clouds 1 Column density 1 Condensation 1 Dissolution 1 Early solar systems 1 Element ratios 1 Elemental compositions 1 Galaxies 1 Galaxies abundances 1 Galaxy evolution 1 Galaxy: abundances 1 Galaxy: disc 1 Galaxy: disks 1 Galaxy: evolution 1 ISM : clouds 1 ISM: atoms 1 ISM: clouds 1 Isotopes 1 MHD 1 Magnesium compounds 1 Method: numerical 1 Molecular clouds 1 Neutron capture 1 Nuclear reactions nucleosynthesis abundances 1 Nucleosynthesis 1 Numerical methods 1