Photolysis of Water (Vacuum UV)

H2O → H· + OH·

概要

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.

参加者

役割 物質 係数 状態
反応物 Water H₂O 1 (g)

日常の例

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

産業上の重要性

真空紫外線による水の光分解は半導体製造用超純水処理や宇宙環境シミュレーションに使用される。

特性

タイプ
Photochemical
可逆的
いいえ
エネルギー
吸熱性
ΔH
498.0 kJ/mol

関連する反応

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.