Adsorption states of protium and deuterium in redeposited polymer hydrocarbon films from a T-10 tokamak

Autor: N. Yu. Svechnikov, B.N. Kolbasov, L. P. Sukhanov, V.G. Stankevich, K. A. Menshikov, A. M. Lebedev, Ya. V. Zubavichus, D. Rajarathnam
Rok vydání: 2009
Předmět:
Zdroj: Journal of Surface Investigation. X-ray, Synchrotron and Neutron Techniques. 3:420-428
ISSN: 1819-7094
1027-4510
DOI: 10.1134/s102745100903015x
Popis: Free redeposited hydrocarbon films (flakes) with a high content of deuterium and hydrogen formed in the T-10 tokamak operating at the Russian Research Centre (RRC) “Kurchatov Institute” are studied using thermal desorption spectroscopy (TDS), infrared (IR) spectroscopy, and X-ray diffraction (XRD) analysis. According to the XRD data, the films contain scattering elements with dimensions of about 1 nm and weakly ordered structures. The TDS curves for D2 (H2) consisting of two groups of peaks at 450–800 and 900–1000 K turn out to be sufficiently similar to the spectra of nanographite obtained by milling graphite mechanically. Two main adsorption states with activation energies of ≈0.65 and ≈1.25 eV/N corresponding to hopping diffusion and resonance mechanisms, respectively, were discovered. The difference between the IR spectra of reddish-gold and dark-brown films is due to both a weaker degree of C-H hybridization of dark films and their disordered carbon network whose ends are connected to CD2,3 fragments.
Databáze: OpenAIRE
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