Other subjects explored include hydrogen bonding effects on the photochemistry of chromophores in solution, photochemical generation of silicon-centered radicals and their reactions, and photochemical processes at the air-water interface of atmospheric droplets.
Caffeine is a central nervous system (CNS) stimulant of the methylxanthine class of psychoactive drugs. It is the world's most widely consumed psychoactive drug, but unlike many other psychoactive substances, it is legal and unregulated in nearly all parts of the world.
Caffeine is a stimulant that naturally occurs in tea, coffee, and cocoa. Plants create the compound through nitrogen metabolism and it acts as a natural pesticide. Caffeine technically classified as a psychoactive drug, due to its stimulating effects on the nervous system.