Measurements of thermal electron attachment rate coefficients to
molecules using an electron swarm technique |
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Authors: | Email author" target="_blank">C A?MayhewEmail author A DJ?Critchley D C?Howse V?Mikhailov M A?Parkes |
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Institution: | (1) School of Physics and Astronomy, University of Birmingham, Edgbaston, B15 2TT, UK;(2) Walsall College of Arts and Technology, St. Pauls Street, Walsall, WS1 1XN, UK |
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Abstract: | An existing electron swarm apparatus has been redesigned and upgraded. In
particular, the new design incorporates a novel planar radioactive foil to
form an integral part of the drift tube, allowing us to overcome inherent
problems present in our earlier system which used a cylindrical radioactive
source. In addition to this, substantial upgrades have been made to improve
the gating and amplification electronics and the data acquisition system.
This has resulted in a much greater signal to noise ratio and improved
accuracy. This paper describes the upgraded apparatus and its use in
obtaining thermal (300 K) attachment rate coefficients to a number of
molecules. The quality of the measurements and data are illustrated through
the measurement of the thermal attachment rate coefficient for SF6
(kth(SF6) = (2.38 ±0.15 ) ×10 -7 cm3 s-1). Thermal electron attachment rate coefficients for four other
molecules are presented, namely for two derivatives of SF6,
SF5CF3 and SF5Cl, and two perfluorocarbons, c-C4F8
and 2-C4F8. |
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Keywords: | |
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