In the photosystem I reaction center, light energy captured by pigment molecules is passed to a special reaction center chlorophyll a called P700.
Photosystem I is a complex of integral membrane proteins. Its function is to capture the sunlight energy and excite an electron to mediate its flow through a series of electrons in order to make the usable form of energy ATP and NADPH. The wavelength of light absorbed by photosystem I is 700 nm.
Chlorophyll a is the most important type of chlorophyll essentially required for photosynthesis. It has the maximum capability to absorb the sunlight energy and convert it into chemical energy.
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