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• The excitation P680 → P680* of the response center pigment P680 happens here. These unique chlorophyll molecules embedded in PSII take in the power of photons, with maximal absorption at 680 nm. Electrons within these molecules are promoted to a better-energy state. This is considered one of two center approaches in photosynthesis, and it takes place with superb performance (more than 90%) because, in addition to direct excitation by way of mild at 680 nm, the electricity of light first harvested via antenna proteins at different wavelengths within the light-harvesting system is also transferred to those special chlorophyll molecules.

• This is followed via the electron switch P680*→ pheophytin, and then directly to plastoquinol, which takes place within the reaction center of PSII. The electrons are transferred to plastoquinone and  protons, generating plastoquinol, which released into the membrane as a cell electron provider. This is the second core manner in photosynthesis. The initial ranges arise inside picoseconds, with an performance of a hundred%. The seemingly not possible efficiency is because of the right positioning of molecules inside the response center. This is a stable-state manner, no longer a regular chemical reaction. It happens inside an essentially crystalline surroundings created through the macromolecular structure of PSII. The usual regulations of chemistry (which involve random collisions and random energy distributions) do no longer follow in stable-kingdom environments.