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 pills are concentrated forms of caffeine and provide energy after they are swallowed. Pills range in dosage, but are generally sold over the counter between 100 and 250 mg. Caffeine pills are not classified as addictive, as other are stimulants such as heroin or cocaine, because they do not produce a compulsion for usage, explains the Palo Alto Medical Foundation.