Eur. Phys. J. Appl. Phys.
Volume 80, Number 3, December 2017
Plasma Sources and Plasma Processes (PSPP)
|Number of page(s)||5|
|Section||Plasma, Discharges and Processes|
|Published online||30 January 2018|
Electron-ion recombination in low temperature hydrogen/deuterium plasma★
Department of Surface and Plasma Science, Faculty of Mathematics and Physics, Charles University,
Prague, Czech Republic
2 Department of Chemical Physics and Optics, Faculty of Mathematics and Physics, Charles University, 12116 Prague, Czech Republic
* e-mail: email@example.com
Received in final form: 16 October 2017
Accepted: 21 November 2017
Published online: 30 January 2018
The stationary afterglow with cavity ring down spectrometer (SA-CRDS) was used to study the recombination of H3+, H2D+, HD2+ and D3+ ions with electrons in low temperature (77–300 K) plasmas in He/Ar/H2/D2 gas mixtures. By measuring effective recombination rate coefficients (αeff) in plasma with mixtures of ions and their dependences on temperature and partial densities of He, H2 and D2, αeff (T, [He],[H2],[D2]), we determined binary (αbinH3, αbinH2D, αbinHD2, αbinD3) and ternary (KH3, KH2D, KHD2, KD3) recombination rate coefficients for H3+, H2D+, HD2+ and D3+ ions. For all four ions we observed very efficient He assisted ternary recombination which is comparable with binary recombination already at [He] =1 × 1017 cm−3. The removal of excited particles in afterglow plasma was monitored to obtain the plasma thermalisation rate at given experimental conditions. The inferred deexcitation rates for reaction of helium metastable atoms with D2 are kD2 (300 K)=(2.1 ± 0.3) × 10−10 cm3 s−1 and kD2 (140 K)=(1.3 ± 0.3) × 10−10 cm3 s−1.
© EDP Sciences, 2017
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