VALENCE-BAND PHOTOEMISSION STUDY OF(Ba,Cs)onW(110)

Tun-Wen Pi, Hong Le, Rong-Tzong Wu and Chiu-Ping Cheng
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Tun-Wen Pi: Synchrotron Radiation Research Center, Hsinchu, Taiwan, ROC
Rong-Tzong Wu: Synchrotron Radiation Research Center, Hsinchu, Taiwan, ROC
Chiu-Ping Cheng: Department of Physics, National Tsing-Hua University, Hsinchu, Taiwan, ROC

Surface Review and Letters (SRL), 1997, vol. 04, issue 06, 1197-1201

Abstract: We present the first valence-band photoemission study ofBaandCson an atomically clean W(110) surface. The cleanness of the tungsten substrate can be justified from both high surface4fcore emission and sharp surface states in the valence-band spectra. UponBa (Cs)adsorption, the work function is lowered to 2.02 (1.76) eV, corresponding to one third of a monolayer. Further, the two symmetric high-lying surface states move little in energy but quench rapidly in intensity and diminish at the work-function minimum. On the other hand, the low-lying surface state at 1.41 eV shifts about 215 meV toward higher binding energy and reduces its emission at thicker coverage. The bonding of theBadorbital with the Wd-like surface states is not found, in contrast to the theoretical calculation and angle-resolved inverse photoemission study ofBaonW(100). From the coverage-dependent interfacial electronic structure and the parallel behaviors manifest in bothBaonWandCsonW, the polarized-covalent model for the alkali-metal–substrate interactions is firmly reinforced.

Keywords: 79.60 Gs; 68.55.Gi (search for similar items in EconPapers)
Date: 1997
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DOI: 10.1142/S0218625X9700153X

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