Observation of the Real Li<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>K</mml:mi></mml:math>Absorption Edge

Abstract

The Li $K$ absorption edge was measured with yield spectroscopy at liquid-nitrogen temperature. The broad feature hitherto considered to be the edge is shown to be a combination of a sharp absorption edge corresponding to a 0.17-eV-wide Li $K$ core level and a rising density of states at the Fermi level.