. The Bell System technical journal . their completedisappearance seemed conclusive evidence that the surface had becomecovered by at least one layer of gas atoms.* The diffraction pattern ofthe first type was weakened only slightly at the time of their disap- * We have not obtained any information regarding the nature of the adsorbed referring to this gas the word atom has been used to mean either atom ormolecule. I APPLICATION OF ELECTRON DIFFRACTION 593 pearance, and we therefore concluded that at the time when thispattern was itself greatly weakened the surface of the crystal wascov
. The Bell System technical journal . their completedisappearance seemed conclusive evidence that the surface had becomecovered by at least one layer of gas atoms.* The diffraction pattern ofthe first type was weakened only slightly at the time of their disap- * We have not obtained any information regarding the nature of the adsorbed referring to this gas the word atom has been used to mean either atom ormolecule. I APPLICATION OF ELECTRON DIFFRACTION 593 pearance, and we therefore concluded that at the time when thispattern was itself greatly weakened the surface of the crystal wascovered by many layers of gas atoms. Furthermore, we were able toconclude that the diffraction pattern of the second type had its originin the film of adsorbed gas, and that many layers of gas were necessaryfor its formation. In Figs. 1-4 are exhibited polar plots of typical electron diffractionbeams belonging to the diffraction pattern of the first type. The curvesof these figures show the effect of gaseous contamination of the crystal.
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Keywords: ., bookcentury1900, bookdecade1920, booksubjecttechnology, bookyear1
