254nm紫外光诱导Mn_2(CO)_(10)的气相光解离沉积动力学

Gaseous Photodissociation Deposition Kinetics of Ultraviolet Photolysis of Mn_2(CO)_10

采用石英晶体微量秤（ＱＣＭ）技术研究了紫外光（２５４ｎｍ）诱导的Ｍｎ２（ＣＯ）１０气相光解离沉积反应，得到Ｍｎ２（ＣＯ）１０气相母体分子浓度与光解离沉积速率呈线性关系，实验结果符合气相分子单光子分解产物形成的速率公式。气相Ｍｎ２（ＣＯ）１０光解离为低配位数的羰基锰，沉积在镀金的石英晶体表面，还研究了不同外加气体下气相Ｍｎ２（ＣＯ）１０的光解离沉积速率。

Using QCM technique, the kinetics of gaseous photodissociation deposition of Mn2(CO)10 induced by 254nm UV light is studied. The linear dependence of the photodissociation deposition rate on the number of original Mn2(CO)10 molecules has been obtained, which conforms to rules of gaseous molecule single-photon dissociation rate equation. The gaseous molecule single-photon dissociation is the rate-determining step in ultraviolet photolysis of Mn2(CO)10 deposition. Mn2(CO)10 photodissociates into manganese carbonyl with lower number of coordination and deposits on the surface of gold plated quartz crystal. The effect of the vapor pressure of Mn2(CO)10 and added gases (O2,CO,N2 and Ar) has also been studied, the result shows that the deposition rate varies obviously with increasing the pressure of the added gases.