Abstract
High precision measurements of the linear part of the Paschen curve are reported for CF4, C2F6, C3F8, n-C4F10 and c-C4F8. From these measurements values for the pressure-reduced limiting electric field strength (E/p)lim and the figure of merit M are derived. These two parameters can be used to characterise the insulating properties of a strongly electronegative gas. With the exception of c-C4F8, the results support the general trend in the M,(E/p) lim functional relationship reported previously, and the existence of a lower limit to the range of validity is suggested. For c-C4F8, the value of M is ten times greater than would he expected from the associated (E/p)lim.
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