#Ali_equation_of_photochemical_reactions. Multiphoton interaction recently has been used in microscopy because of its characteristics in amplification, but fewer studies oriented on its characteristic on driving reactions. This study is straightforward implementation on thermodynamic and photochemistry science. My idea in this article is mixing of Arrhenius equation with Zewail equation using Hamiltonian and then finds out what is outcome. In this theoretical mathematical investigation method of thinking I find the fellows: There is a threshold of wave length, the reactions by multiphoton interaction cannot begin until after cross, likewise Einstein photoelectric effect. The wave length is proportion with the forth root of intensity. Ali equation has the ability to simulate the reality in some extents. I have done some examinations (mathematically so far) like: heat behavior, effect of intensit...