All Physics Faculty Publications

Document Type

Article

Journal/Book Title/Conference

Physical Review B

Volume

47

Issue

11

Publication Date

3-15-1993

First Page

6672

Last Page

6679

DOI

10.1103/PhysRevB.47.6672

Abstract

High-resolution 4f core-level spectra of the Ta(110) surface region have been obtained at 80 and 300 K with 70- and 100-eV synchrotron radiation. The data show that the subsurface core-level binding-energy shift (compared to deeper-lying atoms) for a close-packed bcc(110) surface can be substantial: 65±15 meV for the first underlayer atoms of Ta(110). The surface core-level shift is 360±12 meV at 80 K and decreases by 13±2 meV at 300 K. Final-state screening in both the bulk and surface layers is well described by a constant singularity index of 0.133±0.012. An enhanced phonon broadening at the surface corresponds to a reduced perpendicular Debye temperature for the surface atoms of 128±18 K compared to the bulk Debye temperature of 225 K.

Comments

Published by American Physical Society in Physical Review B. Publisher PDF is available for download through link above.

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