Microwave transient-response measurements of elastic momentum-transfer collision frequencies in argon

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Abstract
A microwave transient-response technique has been used to determine electron-neutral elastic momentum-transfer collision frequencies in argon as a function of electron energy in the range from 0.08 to 4 eV. An analytical technique has been developed for the unfolding of the monoenergetic collision-frequency data from the measured transient-response decay rate. The over-all experimental and analytical error is estimated to be less than ±25% except in the immediate vicinity of the argon Ramsauer minimum where the transient-response results may considerably overestimate the true collision frequency. The results are compared with argon collision-frequency data derived from previous dc swarm measurements and modified effective-range conversions of total elastic scattering data. The transient-response results agree well with the dc swarm data except at the Ramsauer minimum, where the transient-response data agree more closely with the modified effective-range results.