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- W2058779938 abstract "Refraction of x-rays in iron pyrites.---Preliminary values of $ensuremath{delta}=1ensuremath{-}ensuremath{mu}$ were obtained by reflecting the first and fourth orders from a natural face of the crystal. Then, as suggested by Bergen Davis, by grinding the crystal so as to decrease the angle between the beam and the molecular planes to 15ensuremath{'}, the angle of bending was increased from 15ensuremath{''} or less to as high as 210ensuremath{''}. By calibration of the tangent worm and other precautions, lines were measured to 2ensuremath{''}-5ensuremath{''}. The values obtained for $ensuremath{delta}ifmmodetimeselsetexttimesfi{}{10}^{6}$ for $mathrm{MoK}{ensuremath{alpha}}_{1}$, $mathrm{MoK}{ensuremath{beta}}_{1}$, $mathrm{CuK}{ensuremath{alpha}}_{1}$, and $mathrm{CuK}{ensuremath{beta}}_{1}$ are 3.35ifmmodepmelsetextpmfi{}.2, 2.87ifmmodepmelsetextpmfi{}.2, 17.6ifmmodepmelsetextpmfi{}.5 and 13.2ifmmodepmelsetextpmfi{}.4. The corresponding values computed from the Lorentz dispersion formula, assuming 2 electrons in the K ring, are 3.34, 2.66, 17.7 and 13.6. The good agreement seems to indicate that the influence of the natural frequencies of the K electrons is not negligible. The limits of total reflection observed near grazing incidence, gave approximate values of the refraction; and the crowding together of $mathrm{MoK}{ensuremath{beta}}_{1}$ and $mathrm{MoK}{ensuremath{gamma}}_{1}$, near grazing incidence also gave a value of $ensuremath{delta}$ for $mathrm{MoK}{ensuremath{beta}}_{1}$.Wave-lengths of $mathrm{MoK}ensuremath{beta}$, $mathrm{CuK}ensuremath{alpha}$, and $mathrm{CuK}ensuremath{beta}$, are found to be.63102, 1.5372 and 1.3892 A.Grating space of iron pyrites is found to be 2.7028 A." @default.
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- W2058779938 date "1924-08-01" @default.
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- W2058779938 title "The Refraction of X-rays in Iron Pyrites" @default.
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- W2058779938 doi "https://doi.org/10.1103/physrev.24.143" @default.
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