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The spectrum of molybdenum K α rays scattered by graphite at 45 • , 90 • and 135 • has ben compared with the spectrum of the primary beam. A primary spectrum line when scattered is broken up into two lines an "unmodified" line whose wave-length remains unchanged, and a "modified" line whose wave-length is greater than that of the primary spectrum line. Within a probable error of about 0.001 A, the difference in the wave-length (λ − λ0) increases with the angle θ between the primary and thedoi:10.1103/physrev.22.409 fatcat:666vij6suzcobboxy3bt75nzai