The soft X-Ray emission spectra of sodium, beryllium, boron silicon, and lithium

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Abstract
Emission hand forms of several elements obtained with a photon-counting spectrometer are compared with previously published spectra. The sodium L23,I(E)vs λ curve departs from the free electron perabola at energies than about 1 ev from the Fermi limit in accord with the theoretical form. The sodium extrapolated band width is 2.6 ± 0.3 ev. In beryllium K there is no contribution of p states from the bottom of the overlapping second zone. Zone overlap is estimated at 1–2 ev. The extrapolated band width for boron K is estimated at 14.1 ± 0.8 ev. The L23 band of silicon differs from those previously published but is apparently not affected by the temperature or the purity of the silicon. The extrapolated width is 13.4 ± 0.8 ev. A strong line at 253 Å and a blue fluorescence which accompanies the lithium K spectrum are shown to be connected with the reaction with lithium of hydrocarbon molecules not condensed by the cold trap.
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