BAND EFFECTS IN THE FILLED OUTER-SHELL CORE LEVELS OF TANTALUM

A detailed theoretical study of the filled outer-shell core levels of Ta(110) by bandstructure and photocurrent calculations of core level p hotoemission experiments is presented. The important question of the e xistence of bulk bandstructure effects in these levels is addressed. B andwidths of 47 meV and over 1 eV are both shown to exist within the 4 f(7/2) and 5p(3/2) levels, respectively, and to be important in the in terpretation of the core level photoemission spectra. The implications of these effects within the core levels of Ta(110) are discussed.