Photolysis of Water (Vacuum UV)

H2O → H· + OH·

概述

Vacuum UV radiation (< 185 nm) directly dissociates water molecules into hydrogen and hydroxyl radicals. This reaction is significant in atmospheric chemistry on Mars and early Earth, where the photolysis of water vapor contributed to the loss of hydrogen to space and the oxidation of surface minerals.

参与者

角色 物质 系数 状态
反应物 Water H₂O 1 (g)

日常示例

Mars lost most of its water over billions of years partly because UV photolysis split water vapor in the upper atmosphere.

工业重要性

真空紫外光解水用于超纯水制备，去除痕量有机物，对半导体和制药行业的超高纯水生产至关重要。

属性

类型
Photochemical
可逆
否
能量
吸热
ΔH
498.0 kJ/mol

相关反应

Photochemical Smog Formation (NO₂ Photolysis) Photochromism of Spiropyran Chlorophyll Fluorescence Photodegradation of Methylene Blue by TiO₂ Photodissociation of Chlorine Gas Silver Bromide Photodecomposition Cis-Trans Isomerization of Retinal Photosynthesis Ozone Formation by UV Light Dye-Sensitized Solar Cell (Grätzel Cell)

Frequently Asked Questions

What is the equation for Photolysis of Water (Vacuum UV)?
The balanced equation is: H₂O → H· + OH·.
What type of reaction is Photolysis of Water (Vacuum UV)?
Photolysis of Water (Vacuum UV) is a photochemical reaction.
Is Photolysis of Water (Vacuum UV) exothermic or endothermic?
Photolysis of Water (Vacuum UV) is endothermic (absorbs energy). The enthalpy change (ΔH) is 498.0 kJ/mol.