The absorbed light energy excites chlorophyll a molecules, causing them to emit highenergy electrons that pass down an ELECTRONTRANSPORT CHAIN, releasing energy to synthesize ATP (photophosphorylation) and NADPH.

• 吸收的光能可激发叶绿素a产生高能电子，经电子传递链传递后，释放能量合成ATP（光合磷酸化）和NADPH。