Crossed Molecular Beam Study on the Reaction Dynamics of Fluorine Molecule with Propene
碩士 === 國立臺灣大學 === 化學研究所 === 96 === 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 reacti...
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| Format: | Others |
| Language: | en_US |
| Published: |
2008
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| Online Access: | http://ndltd.ncl.edu.tw/handle/69491314414815875048 |
| Summary: | 碩士 === 國立臺灣大學 === 化學研究所 === 96 === 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.
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