التفاصيل البيبلوغرافية
| العنوان: |
Site specific dissociation dynamics of propane at 157 nm excitation. |
| المؤلفون: |
Wu, S. M., Wu, S.M., Lin, J. J., Lin, J.J., Lee, Y. T., Lee, Y.T., Yang, X. |
| المصدر: |
Journal of Chemical Physics. 5/8/2000, Vol. 112 Issue 18. 1 Diagram, 2 Charts, 23 Graphs. |
| مصطلحات موضوعية: |
*PROPANE, *DISSOCIATION (Chemistry), *EXCITED state chemistry |
| مستخلص: |
Photodissociation of propane at 157 nm excitation has been investigated using the photofragment translational spectroscopic (PTS) technique. Three dissociation channels have been experimentally observed: the atomic hydrogen (H) elimination, the molecular hydrogen (H[sub 2]) elimination, and the methyl radical (CH[sub 3]) elimination. Product translational energy distributions have been measured and relative branching ratios have also been estimated, which indicate that all these three processes are significant. The site effects on the H and H[sub 2] elimination have been quantified by investigating the photodissociation of the four propane isotopomers: CH[sub 3]CD[sub 2]CH[sub 3], CD[sub 3]CH[sub 2]CD[sub 3], CH[sub 2]DCH[sub 2]CH[sub 2]D, and CD[sub 3]CD[sub 2]CD[sub 3]. Experimental results indicate that the yield of the H elimination from the two terminal CH[sub 3] groups (terminal-H elimination) is larger than that from the internal CH[sub 2] group (internal-H elimination). H[sub 2] elimination from the internal carbon atom of propane (2,2-H[sub 2] elimination) is the dominant process while H[sub 2] elimination channels from the vicinal carbon atoms (1,2-H[sub 2] elimination) are less significant. Minor processes of H[sub 2] elimination from terminal carbon atoms (1,1-H[sub 2] and 1,3-H[sub 2] elimination) were also observed. The translational energy distributions also show that the dynamics of H and H[sub 2] elimination from different sites are significantly different. Relative branching ratios of H and H[sub 2] elimination processes from different sites have also been determined. © 2000 American Institute of Physics. [ABSTRACT FROM AUTHOR] |
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