Letter | Published:

Electronic Energy Bands of Solid Copper, Nickel, Cobalt and Iron

Naturevolume 135page998 (1935) | Download Citation



DURING the course of experiments on the soft X-radiations of the elements copper, nickel, cobalt and iron, evidence of electronic energy bands has been obtained. The examination of the radiations was made with a tangential grating vacuum spectrograph, and the lines under investigation were the group comprising the L series. These, and especially the La line, have been obtained with considerable intensity. Examination of the plates has shown a blackening on the long-wave side of La. Microphotometer records demonstrate that this is due to the fact that the line, although possessing a comparatively sharp peak, drops to zero very slowly on this side, and extends almost to the L line. Making an allowance for the slit width of the instrument, the wave-length difference between the maximum of intensity of the line and the end of the tail is, for copper, 1·21 A. This corresponds to the large energy difference of 77·5 electron volts. The other three elements give energy differences somewhat less, but of the same order.

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  1. 1

    Houston, Phys. Rev., 38, 1791; 1931. O'Bryan and Skinner, Phys. Rev., 44, 602; 1933. 45, 370; 1934.

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  1. University College, London, W.C.1

    • F. C. CHALKLIN


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