| Autor: |
Jabbour, Z. J., Becker, K. |
| Předmět: |
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| Zdroj: |
Journal of Chemical Physics; 5/1/1989, Vol. 90 Issue 9, p4819, 7p |
| Abstrakt: |
We analyzed the optical emissions in the wavelength region 2000–8000 Å produced by dissociative electron impact on CCl2F2. Absolute photoemission cross sections have been determined for a variety of neutral and ionic fluorine and chlorine lines as well as for the strong diatomic CCl and CCl+ bands at 2778 and 2368 Å, respectively. In many cases comparisons between experimentally determined appearance potentials and spectroscopic and thermochemical data enabled a unique identification of the underlying break-up mechanism of the parent molecule upon electron impact. Atomic fluorine emissions which are the result of the total fragmentation of the parent molecule dominate the spectrum from 6000 to 8000 Å with absolute emission cross sections in the range of 0.1 to 3.5×10-19 cm2 at 100 eV for individual 3p→3s fine structure lines. The prominent continuous emission between 2200 and 4000 Å was found to consist of two contributions, the D 2B2→X 2B2 emission of the CCl2F+2 parent ion with an appearance potential of 14.2±1.0 eV and a second emission feature with an appearance potential around 42 eV which has not been uniquely identified. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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