第6卷‧第2期,
198204
, pp. 148-156
光分解運動學
- 作者:
陳國美
- 作者服務機構:
國立中山大學化學系
- 中文摘要:
在分子束環境中發生之光分解過程,提供分離化合物一全能方法。其分離機理源於光碎片之反彈。利用此反彈機理之分離機,其收集效益與光碎片在實驗室座標之角度分佈有關。在分離重同位素或只有少量平移反彈能量時,對實驗室角度分佈之了解,更為重要。 本文利用密度矩陣及狀態多極子技巧,導出由質量中心至實驗室座標的量子力學變換係數。從而得到雙原子分子在光分解後,碎片在實驗室的角度分佈。此一理論詳盡敘述角度分佈函數,與實驗幾何配置,分解能量及光碎片質量之間的參量關係,並預測角度分佈具有振盪行為。
- 英文摘要:
Photodissociation processes in a molecular beam environment provide a universal scheme to separatechemical species. The separation mechanism draws naturally from the recoil of photofragments. The col-lection efficiency of a separation machine, which is based on this recoil mechanism, depends on the angulardistribution of photofragments in the laboratory frame. Our knowledge of the laboratory angular distribu-tion are of prime importance in separation processes of heavy isotopes or species of limited translationalrecoil energies. In this paper, we have derived quantum mechanical center-of-mass to laboratory transformationcoefficients in the realm of the density matrix and state multipoles languages. They have been applied tothe laboratory angular distribution of fragments from photodissociated diatomic molecules. Several limitedcases are discussed to illustrate the generality of our formulation. A coherent picture is given to describeparametric dependence of the angular distribution function on the geometry of an experimental setup;also the available dissociation energy and masses of two separated photofragments are described. An oscil-latory behavior of the angular distribution, which deserves confirmation by a high-resolution experiment,is predicted.
- 中文關鍵字:
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- 英文關鍵字:
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