Reviewing photo-induced processes that have relevance to a wide-ranging number of academic and commercial disciplines, this volume reflects the current interests in chemistry, physics, biology and technology. Highlight chapters include the molecules of colour, solar photocatalysis, photochemistry in cryogenic matrices, photoresponsive hydrogels and molecular photoswiches. Essential reading for postgraduates, academics and industrialists working in the field of photochemistry, enabling them to keep on top of the literature.