UV‐Photoemission Study of the Energy Bands in Solid CsAu

Abstract

Die kritischen Punkte der quasibinaren RandsystemeDie kritischen Temperaturen, oberhalb derer auf den Randern keine Entmischungen mehr beobachtet werden konnen, betragen daher:Fur die quasibinaren senkrechten Randschnitte der Spinodalflache T(k,I) erhalt man aus den Bedingungen limX = 2aMN und lim Y = 2 xXy die Kurven:Y-a: UV photoemission spectra for photon energies h v = 21.1 (HeI) and h v = 40.8(HeII) have been used to investigate the electronic band structure of solid CsAu. Previous measurements of the electronic transport properties together with an theoretical band structure calculation have formed the basis for the interpretation of the spectra. The data directly show the positions of the occupied bands which are derived from the 6s and 5d states of Au and the 5p states of Cs. The apparent spin-orbit splitting of the 5d-orbitals of Au is found to be 2.1 eV, i.e. 40% larger in the compound CsAu than in the Au-atom. The energetic positions of the maxima of the different spectra compare well with the density of states calculated with the relativistic KKR method.* ) Fachgebiet Kernchemie.

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“…3 CsAu liquifies at 590 °C to give a melt that exhibits ionic conductivity. 4 In addition, an ESCA study on RbAu and CsAu, 5 reveals the high value for the binding energy of the CsAu molecule, 6 and UV-photoemission experiments 7 on solid CsAu support the ionic interpretation. The anionic character of the gold in RbAu and CsAu has also been studied by 197 Au Mössbauer spectroscopy.…”