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Home    Απόλυτος προδιορισμός του συντελεστή ταχύτητας της αντίδρασης ριζών υδροξυλίου (ΟΗ) με τον 2,2,2 τρίφθορο -αιθυλο-μεθυλαιθερα (CF3CH2OCH3),στην αέρια φάση με την τεχνική VLPR- LIF/MS  

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Identifier 000040098
Title Απόλυτος προδιορισμός του συντελεστή ταχύτητας της αντίδρασης ριζών υδροξυλίου (ΟΗ) με τον 2,2,2 τρίφθορο -αιθυλο-μεθυλαιθερα (CF3CH2OCH3),στην αέρια φάση με την τεχνική VLPR- LIF/MS
Alternative Title Determination of the absolute rate coefficient for the reaction of OH radicals with 2,2,2 trifluoro-ethyl-methyl ether (CF3CH2OCH3),in the gas phase,applying VLPR- LIF/MS technique
Author Ευφραιμίδης, Ιωσήφ
Thesis advisor Παπαγιαννακόπουλος, Πάνος
Abstract In the present work, the rate coefficient for the reaction of hydroxyl radicals with 2,2,2 trifluoro-ethyl-methyl-ether (CF3CH2OCH3, TFEME), in the gas phase, was determined at the temperature of 298 K with VLPRMS/LIF (Very Low Pressure Reactor Mass Spectrometry/Laser Induced Fluorescence) technique. The study of the title reaction was stimulated by the fact that TFEME belongs to the lately suggested as CFC alternatives group, of hydrofluoroethers (HFE). In order to verify the reliability of the measured reaction rate coefficient, employing VLPRMS/LIF, tracing experiments with very well studied compounds (Ethylic Alcohol and Ethyl Ether) were performed on advance. These particular compounds were selected, because they have many similarities, in terms of molecular structure, with the title compound. The determination of the absolute rate coefficients for the reactions of OH radicals with the selected compounds were performed employing the effusive molecular beam VLPRMS/LIF technique, at the temperature of 298 K. Mass spectrometry was applied to monitor reactants and stable products continuously, right after escaping from the reactor. On the other hand, LIF technique was exclusively employed for the continuous monitoring of hydroxyl radicals. The rate coefficients that were measured for the three reactions are: Experimental results showed that all three reactions are quite fast and occur via hydrogen atom metathesis mechanism leading to the formation of water (H2O) and the respective dehydrogenated radical.
Language Greek
Issue date 2004-11-01
Collection   School/Department--School of Sciences and Engineering--Department of Chemistry--Post-graduate theses
  Type of Work--Post-graduate theses
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