caa a22 4500 445867140 CHVBK 20180317145501.0 cr unu---uuuuu 170323e20111201xx s 000 0 eng 10.1140/epjd/e2011-20296-7 doi (NATIONALLICENCE)springer-10.1140/epjd/e2011-20296-7 Effect of small admixtures of N2, H2 or O2 on the electron drift velocity in argon: experimental measurements and calculations [Elektronische Daten] [M. Stano, N. Pinhão, D. Loffhagen, M. Kučera, Z. Donkó, Š. Matejčík] The electron drift velocity in argon with admixtures of up to 2% of nitrogen, hydrogen or oxygen is measured in a pulsed Townsend system for reduced electric fields ranging from 0.1Td to 2.5Td. The results are compared with those obtained by Monte Carlo simulations and from the solution of the electron Boltzmann equation using two different solution techniques: a multiterm method based on Legendre polynomial expansion of the angular dependence of the velocity distribution function and the S n method applied to a density gradient expansion representation of the distribution function. An almost perfect agreement between the results of the three numerical methods and, in general, very good agreement between the experimental and the calculated results is obtained. Measurements in Ar-O2 mixtures were limited by electron attachment to oxygen molecules, which contributes to the measured drift velocity. As a result of this attachment contribution, the bulk drift velocity becomes larger than the flux drift velocity if attachment is more probable for electrons with energy below the mean value and smaller in the opposite case. Attachment also contributes to the negative differential conductivity observed in Ar-O2 mixtures. EDP Sciences, SIF, Springer-Verlag Berlin Heidelberg, 2011 Stano M. Comenius University, Mlynska Dolina F2, 84248, Bratislava, Slovakia aut Pinhão N. Nuclear and Technological Institute, Estrada Nacional 10, 2686-953, Sacavém, Portugal aut Loffhagen D. Leibniz Institute for Plasma Science and Technology, Felix-Hausdorff-Str. 2, 17489, Greifswald, Germany aut Kučera M. Comenius University, Mlynska Dolina F2, 84248, Bratislava, Slovakia aut Donkó Z. Research Institute for Solid State Physics and Optics, P.O. Box 49, 1525, Budapest, Hungary aut Matejčík Š. Comenius University, Mlynska Dolina F2, 84248, Bratislava, Slovakia aut The European Physical Journal D Springer-Verlag 65/3(2011-12-01), 489-498 1434-6060 65:3<489 2011 65 10053 https://doi.org/10.1140/epjd/e2011-20296-7 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1140/epjd/e2011-20296-7 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Stano M. Comenius University, Mlynska Dolina F2, 84248, Bratislava, Slovakia aut NATIONALLICENCE 700 1- Pinhão N. Nuclear and Technological Institute, Estrada Nacional 10, 2686-953, Sacavém, Portugal aut NATIONALLICENCE 700 1- Loffhagen D. Leibniz Institute for Plasma Science and Technology, Felix-Hausdorff-Str. 2, 17489, Greifswald, Germany aut NATIONALLICENCE 700 1- Kučera M. Comenius University, Mlynska Dolina F2, 84248, Bratislava, Slovakia aut NATIONALLICENCE 700 1- Donkó Z. Research Institute for Solid State Physics and Optics, P.O. Box 49, 1525, Budapest, Hungary aut NATIONALLICENCE 700 1- Matejčík Š. Comenius University, Mlynska Dolina F2, 84248, Bratislava, Slovakia aut NATIONALLICENCE 773 0- The European Physical Journal D Springer-Verlag 65/3(2011-12-01), 489-498 1434-6060 65:3<489 2011 65 10053 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer