Photochemistry and chemical kinetics in the interstellar medium.
D055580:Astronomical Phenomena; D001256:Astronomy; D055598:Chemical Phenomena; D002621:Chemistry; D003359:Cosmic Radiation; D007700:Kinetics; D010777:Photochemistry; D011830:Radiation Effects; D013696:Temperature; D013816:Thermodynamics; D014466:Ultraviolet Rays