Part 1 Experimental techniques: methods of matrix preparation; methods of detection. Part 2 Physical processes in matrices - energy transfer. Part 3 Photochemistry in matrices: metal carbonyls and related compounds; carbenes and divalent silicon and related compounds. Part 4 Low-energy species and interconversions: complexes of hydrogen fluoride; rotamers and specific photoconversion processes. Part 5 High-energy species: radical cations; studies of high-temperature molecules. Part 6 Atoms and small clusters: matrix-isolated atoms; small metal or metalloid clusters; reactions of iron atoms. Part 7 Astrochemistry and atmospheric processes: identification of features and processes occurring in outer space; analysis of processes occurring in the Earth's atmosphere.