• 作者： 邱紀良
• 作者服務機構： 國立清華大學化學系
• 中文摘要： 利用氙?或碘石英?的白光為光源，把氣相的二氯化二硫加以光分解。我們發現二氯化一硫是光分解產物之一，並
  且它在光照射之下與二氯化二硫是可互相轉化的。在光分解反應的中後期，二氯化二硫與二氯化一硫經過自由基之反應
  達到相互平衡，但同時兩者又都繼續光分解為最後產物：氯及硫元素。
  我們改變光源強度及二氯化二硫的濃度來對二氯化二硫光分解反應速率法則做定性研究。我們發現最可能的分解過
  程是直接光分解；速率I(λ)dλ在不變狀態的假設下，同類型的法則也可經由演繹而得到，速率 (方程式無法摘錄) ，其中連
  加是包括由二氯化二硫可能分解途徑的四項以及由二氯化一硫和氯氣來的三項。我們同時也指出二氯化一硫及氯在二氯
  化二硫的光分解反應中可能扮演的催化劑角色。
  將入射光限於波長在300nm以上的光，並利用質量平衡的計算，我們推斷二氯化二硫的光分解是以分解為SCI為其
  主要分解途徑。
  e
• 英文摘要： The gas phase SC1 is photolyzed by polychromatic radiation either from Xe lamp or from quartz-halogen lamp. SC1 is one of the photodecomposition products and is interconvertible with SC1 underirradiation. Equilibrium between SC1 and SC1 is established through radical reactions at the later stageof photolyzing while both of them are still decomposing and forming chlorine and sulfur as the final pro-ducts at relatively very low rates. A qualitative study on the rate law of the photodecomposition reaction of SC1 is carried out undervarying conditions of SC1 concentration and light intensity. It is found that direct photodissociations arethe most probable processes: rate (方程式無法摘錄) . A steady state derivation also leads to the same type of ex-pression: rate= (方程式無法摘錄) , where the summation is over four possible dissociation routes of SC1 andthree additional terms from SC1 and C1. The potential catalytic effects of SC1 and C1 in the SC1photodecomposition system are pointed out. A mass balance calculation indicates that SCI is the mainprimary photolytic product if a pyrex glass filter is used.
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