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An explanation of discrepancies between predictions of the Kroll-Watson theory and cross sections measured in the Wallbank-Holmes experiments on electron-atom scattering in the presence of a powerful lowfrequency laser field is presented. Our model calculations for helium and argon as target atoms come out to be in good agreement with experimental results; i.e., obtained cross sections are by many orders of magnitude larger than those predicted by the Kroll-Watson theory. A mechanism responsible for such a substantial increase of the calculated cross sections is found to be due to the diffraction scattering of electrons by atomic obstacles. ͓S1050-2947͑97͒50912-7͔ PACS number͑s͒: 34.50.Rk, 32.80.Ϫt, 03.65.Nk RAPID COMMUNICATIONS R4396 56 A. JAROŃ AND J. Z. KAMIŃ SKI

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