https://doi.org/10.1140/epjd/e2008-00288-6
Electron swarm coefficients in 1,1,1,2 tetrafluoroethane (R134a) and its mixtures with Ar
1
Instituto de Ciencias Físicas, Universidad Nacional Autónoma de México, P.O. Box 48, Mor., Mexico
2
Depto. de Ciencias Básicas, Universidad Autónoma Metropolitana, Av. San Pablo 180, 02200, México, DF, Mexico
3
Depto. de Energía, Universidad Autónoma Metropolitana, Av. San Pablo 180, 02200 México, DF, Mexico
Corresponding author: a jdu@fis.unam.mx
Received:
27
September
2008
Published online:
16
January
2009
Using a pulsed Townsend technique, we have measured the drift velocity, the longitudinal diffusion coefficient and the effective ionisation coefficient of electrons in R134a and R134a-Ar over a wide range of the density-reduced electric field intensity, E/N. Regarding the measurement of the electron drift velocities and of the effective ionization coefficients, we have covered a wider range than that hitherto achieved for pure R134a. Both the electron drift velocity and the effective ionisation coefficient have been found in very good agreement with those published in the literature, covering a shorter range of E/N. On the other hand, the swarm coefficients on R134a-Ar are, to the best of our knowledge, the first to be published. It is hoped that these data will be of interest for the test/derivation of electron collision cross sections for this important hydrofluorocarbon gas, which is nowadays of great use in gaseous detectors.
PACS: 52.80.-s – Electric discharges / 51.20.+d – Viscosity, diffusion, and thermal conductivity / 52.80.Dy – Low-field and Townsend discharges / 52.25.Fi – Transport properties / 51.50.+v – Electrical properties (ionization, breakdown, electron and ion mobility, etc.)
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag, 2009
