Eur. Phys. J. Appl. Phys.
Volume 80, Number 2, November 2017
Plasma Sources and Plasma Processes (PSPP)
|Number of page(s)||4|
|Published online||27 October 2017|
Experimental and theoretical investigation of Fe-catalysis phenomenon in hydrogen thermal desorption from hydrocarbon plasma-discharge films from T-10 tokama★
National Research Centre Kurchatov Institute,
2 Moscow Institute of Physics and Technology, 141700 Dolgoprudny, Russia
* e-mail: email@example.com
Received in final form: 18 September 2017
Accepted: 27 September 2017
Published online: 27 October 2017
Investigations of the effect of Fe impurities on D2 thermal desorption (TD) from homogeneous CDx films (x ∼ 0.5) formed in the D-plasma discharge of the T-10 tokamak were carried out. The experimental TD spectra of the films showed two groups of peaks at 650–850 K and 900–1000 K for two adsorption states. The main result of the iron catalysis effect consists in the shift of the high-temperature peak by −24 K and in the increase in the fraction of the weakly bonded adsorption states. To describe the effect of iron impurities on TD of hydrogen isotopes, a structural cluster model based on the interaction of the Fe+ ion with the 1,3-C6H8 molecule was proposed. The potential energy surfaces of chemical reactions with the H2 elimination were calculated using ab initio methods of quantum chemistry. It was established that the activation barrier of hydrogen TD is reduced by about 1 eV due to the interaction of the Fe+ ion with the π-subsystem of the 1,3-C6H8 molecule leading to a redistribution of the double bonds along the carbon system.
© EDP Sciences, 2017
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