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| Titel |
ON REACTION RATE CONSTANTS Cl + CH3I, C3F7I, CF3I |
| VerfasserIn |
Igor Larin, Alexandr Spasskiy, Elen Trofimova |
| Konferenz |
EGU General Assembly 2011
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 13 (2011) |
| Datensatznummer |
250046225
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| Zusammenfassung |
| Last time reactions of chlorine atoms with iodine containing hydrocarbons both natural and
antropogenic origin are attracted significant attention [see V. Dookwah-Roberts et al., 2008;
T. J. Gravestock et al., 2008]. It is explained mainly by the potential extinguishing properties
of these substances. What about chlorine atoms they are considered now to be possible very
effective “destroyers” of hydrocarbons in the troposphere [see A.R.Ravishankara,
2009].
In the present work the reaction rate constants of chlorine atoms with CH3I (k1), C3F7I,
(k2) and CF3I (k3) have been measured at the temperature 295 K under conditions of the flow
reactor. The rate constants of the reactions investigated have been turned out to be
equal:
k1 = (0.9 ± 15) 10-11 molecula-1cm3s-1; k2 = (5.2 ± 0.3) 10-12 molecula-1cm3s-1;
k3 = (7.4 ± 0.6) 10-13 molecula-1cm3s-1.
At measurements the concentration both chlorine atoms and iodine atoms have been
measured by method of resonance fluorescence. It has been proved that under conditions of
our experiments the reaction of chlorine atoms with CH3I proceeds on the wall surface of the
reactor while reactions of chlorine atoms with CF3I and C3F7I do in the gas phase. At
analysis of experimental data a method has been applied which allows to reveal the influence
of the wall of the reactor on the rate of the reaction under investigation. Physical base of the
method developed is an applying various carrier gases in the experiments to provide
different conditions for the reactive components to reach the wall of the reactor. So,
changing by the known way time of diffusion of active components to the wall of
the reactor it is possible to estimate the wall effects on the rate of the reaction. |
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