Photochemistry
![Photochemical immersion well reactor (50 mL) with a mercury-vapor lamp.](/Images/godic/202502/02/Photochemical_immersion_well_reactor_50_mL2417.jpg")
![](/Images/godic/202502/02/JablonskiWithVibration2417.png")
![Photochemical immersion well reactor (750 mL) with a mercury-vapor lamp](/Images/godic/202502/02/Photochemical_immersion_well_reactor_750_mL2417.JPG")
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Photochemistry is the branch of chemistry concerned with the chemical effects of light. Generally, this term is used to describe a chemical reaction caused by absorption of ultraviolet (wavelength from 100 to 400 nm), visible light (400 – 750 nm) or infrared radiation (750 – 2500 nm).