Illustrate S' state mechansm.

Explanation

S'State Mechanism consists of a seires of 5 states called as `S_(0) , S_(1),S_(2),S_(3)` and `S_(4)` . Each state acquires positive charges by a photon (hv) and after the `S_(4)` state it acquires 4 positive charges, four electrons charges evolution of oxgyen . Two molecules of water go back to the `S_(0)` . At the end of photolysis 4 `H^(+)` , 4 e- and `O_(2)` are evolved form water .