Electronic Resource
College Park, Md.
:
American Institute of Physics (AIP)
The Journal of Chemical Physics
90 (1989), S. 4819-4825
ISSN:
1089-7690
Source:
AIP Digital Archive
Topics:
Physics
,
Chemistry and Pharmacology
Notes:
We analyzed the optical emissions in the wavelength region 2000–8000 A(ring) 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 A(ring), 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 A(ring) 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 A(ring) 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.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1063/1.456575
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