• 作者： 李雅蓉; 陳福堂; 薛振昌; 周詳明; 陳錫銓; 楊雅菁; 林森茂
• 作者服務機構： 中央研究院原子分子研究所; 台灣大學化學系
• 中文摘要： 藉可旋轉分子束儀器，量測紫外光分解生成物的平移速率分佈及方向性，探討甲基碘及溴仿的光分解機制。甲基碘的實驗·其結果與文獻一致，可用於闡明儀器的靈敏度及解析度。溴仿的光分解，除主要的一級生成物為一不等向性陸逸散外，尚有二次的分解產物。
• 英文摘要： The photodissociations of CH3I and CHBr3 at their first absorption continuum were studied by meansof translational spectroscopy. In the case of CH3I, measurements of the time-of-flight distributions and ofthe angular dependence of the dissociation products were carried out to demonstrate the detector sensitivityand resolution of the rotatable beam source apparatus. The results of photodissociation of CHBr3 at 248nm showed that the formation of CHBr2 + Br productswas the only important process with a broad recoil energy distribution which peaked at about 13 kcal/mol.The anisotropy parameter was determined to be β = 0.2 ± 0.1, indicating that the molecule dissociated ina time shorter than its rotational period. Therefore, the fragmentation of the CHBr3 molecule was a directdissociation process.
• 中文關鍵字： photodissociation; CH3I; CHBr3; translational spectroscopy; time-of-flight distribution; anisotropy parameter
• 英文關鍵字： --