The rate constant for electron attachment to SFg, N20, and 02 in liquid argon and xenon was studied as a function of an external electric field up to 5 V cm-1. While Me-" + SF6) and k(e~+ 02) decreased with increasing field strength, Me-+ N20) exhibited a nearly 100 fold increase. The field effect on the rate constant in the liquefied rare gases is related to the increase of the mean electron energy by the external field. By means of the Cohen-Lekner theory electron energy distribution functions were obtained and a rough estimate of the energy dependence of the attachment cross section could be deduced.

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