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標題: | 利用交叉分子束研究氟分子與丙烯之反應動力學 Crossed Molecular Beam Study on the Reaction Dynamics of Fluorine Molecule with Propene |
作者: | Jing-Wen Fang 方靜雯 |
指導教授: | 李遠哲(Yuan-Tseh Lee),林志民(Jim J. Lin) |
關鍵字: | crossed molecular beam,dynamics,backward scattering,early barrier,methyl-substitution effect, |
出版年 : | 2008 |
學位: | 碩士 |
摘要: | The reaction of F2 + C3H6 was investigated using crossed molecular beam technique for a wide range of collision energy. The F + C3H6F was observed to be the only primary product channel; the HF + C3H5F product channel was searched but not found. The relative reaction cross section was measured as a function of collision energy; the reaction threshold was determined to be 2.4 ± 0.3 kcal/mol. Time-of-flight spectra and angular distributions of the products were measured and analyzed. The center-of-mass frame angular distribution displayed strongly backward, indicating that the reaction time scale is much shorter than one rotational period of the collision complex. All experimental results support a rebound reaction mechanism, which agrees with the structure of the calculated transition state. The transition state geometry suggests an early barrier; such dynamics is consistent with the small kinetic energy release of the products observed in the experiment. Compared with the F2 + C2H4 reaction, both the experimental and computational results in the present reaction give the same trend that the methyl-substitution effect in propene reduced the reaction threshold by about 3 kcal/mol. |
URI: | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/37123 |
全文授權: | 有償授權 |
顯示於系所單位: | 化學系 |
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