Science behind ATS: photosynthesis, ATP, and all that jazz
From SM:
A basic starting place:
http://en.wikipedia.org/wiki/Primary_production
http://en.wikipedia.org/wiki/Calvin_cycle
http://en.wikipedia.org/wiki/Light-dependent_reactions
From the last one...
The light-dependent reactions begin in photosystem II. When a chlorophyll a molecule within the reaction center of PSII absorbs a photon, an electron in this molecule attains a higher energy level. Because this state of an electron is very unstable, the electron is transferred from one to another molecule creating a chain of redox reactions, called an electron transport chain...