. The Bell System technical journal . averested upon a rather inadequate experimental basis.) 5 C. J. Davisson and L. H. Germer, Proc. Nat. Acad. Sci., 14, 619 (1928).* Bethe, Naturwissenschaften, 16, Hi (1928). 594 BELL SYSTEM TECHNICAL JOURNAL Fig. 1 consists of two electron scattering curves showing a (422)reflection which occurs at an electron wave-length of A. Thecurve on the left was taken before the crystal had been heated after thesealing of the bulb containing it from the pumps. In the curve on theright is shown this same diffraction beam soon after the crystal washeated. From th
. The Bell System technical journal . averested upon a rather inadequate experimental basis.) 5 C. J. Davisson and L. H. Germer, Proc. Nat. Acad. Sci., 14, 619 (1928).* Bethe, Naturwissenschaften, 16, Hi (1928). 594 BELL SYSTEM TECHNICAL JOURNAL Fig. 1 consists of two electron scattering curves showing a (422)reflection which occurs at an electron wave-length of A. Thecurve on the left was taken before the crystal had been heated after thesealing of the bulb containing it from the pumps. In the curve on theright is shown this same diffraction beam soon after the crystal washeated. From the reasoning given above we know that at the timethe left-hand curve was taken the crystal surface was covered by manylayers of adsorbed gas, and that when the right-hand curve was takenthe surface of the crystal was comparatively clean. Fig. 2 is similar to Fig. 1. It shows the increase in intensity of a(622) reflection when the crystal surface was cleaned by such a cleaning the surface became gradually covered again by.
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