X unit

The X - unit ( XE ) and Siegbahn unit is a unit of length outside the SI system.

History

The X - unit was defined in 1925 by the Swedish physicist Karl Manne Siegbahn than 1/ 3029 04 the distance of the (200 ) lattice planes of calcite at 18 ° C. Siegbahn wanted a unit that corresponds to about 10-13 m, in fact it is ( 1.00206 ± 0.00005 ) · 10-13 m, or about 0.1 picometers.

Until 1965 it was used in the X-ray spectroscopy and then replaced by the Ångström.

Swell

  • JA Bearden: X- Ray Wavelength Conversion Factor Λ (? G /? S ). In: Physical Review. 137, No. 1B, 1965, p B181, doi: 10.1103/PhysRev.137.B181 ( length of the X - unit in metric units).
  • Outdated unit (Physics)
  • Unit of length
Digital Object Identifier
729057
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