Abstract

WE have made two Debye-Scherrer exposures of solid krypton at the temperature of liquid hydrogen boiling under normal pressure, one with copper Kα radiation, the other one with unfiltered iron radiation. As was to be expected, we found a face-centred cubic lattice. The lattice constant is 5.59 A. The calculated density is 3.13. The distance of the centres of neighbouring krypton atoms amounts to 3.96 A., whereas from viscosity measurements the value 3.23 A. is deduced for the diameter of the atoms. Ratio 1.22; the analogous ratios for neon, argon, and xenon are 1.35, 1.29, and 1.23 respectively.

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