Document Type

Research

Abstract

For most of the M₅ and M₄ x-ray absorption edges already measured there is a discrepancy between observed and calculated values. The M₁ edges occasionally have a small discrepancy while the M₂ and M₃ edges seldom show any. Siegbahn and Phelps have suggested that the final levels in the edge transitions are valence and low lattice levels and that the selection rule Δ1= ± 1 is usually giving the transition preference. A change in atomic spacing of a metal, such as often results from alloying it, should produce a change in the energies of its lattice levels. The gold M₅ and M₄ edges from gold and from a 50 atomic per cent copper gold alloy were photographed in a vacuum spectrometer. Significant shifts to higher energies in M₅ of 2.5 electron volts and in M₄ of 6.8 volts were found. These results show that the final levels in M absorption transitions are lattice levels, and they give credence to the assumption that there are preferred atomic to lattice level transitions.

Publication Date

1939

Journal Title

Proceedings of the Iowa Academy of Science

Volume

Issue

First Page

270

Last Page

271

Copyright

Language

File Format

application/pdf

Recommended Citation

McGrath, J. W. (1939) "The M5 and M4 Edges of Gold in the Pure State and in a Gold Copper Alloy," Proceedings of the Iowa Academy of Science, 46(1), 270-271.
Available at: https://scholarworks.uni.edu/pias/vol46/iss1/88

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The M5 and M4 Edges of Gold in the Pure State and in a Gold Copper Alloy

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