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The pulse-height spectrum produced by the decay of A 37 in a proportional counter was analyzed to determine the probability, per i^-electron capture, for the production of a double vacancy in the K shell. The double vacancy is produced by promotion of the second K electron to a bound state or to the continuum. In these experiments both processes could be observed; the measurements included events in which the kinetic energies of the promoted electrons were in the range zero to 4.0 kev. Seventy-three percent of the theoretically predicted total effect should occur in this energy interval. The data, appropriately corrected, give for the probability of double X-vacancy production per K capture, in the energy interval investigated, 3.9±0.7X10~4. The result is substantially in agreement with the value calculated from theory.f Research carried out under the auspices of the U. S. Atomic Energy Commission. 1

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