Ta(110) Surface and Subsurface Core-level Shifts and 4f7/2 Lineshapes

Authors

D. Mark Riffe, Utah State UniversityFollow
G. K. Wertheim

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

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.

Recommended Citation

"Ta(110) Surface and Subsurface Core-level Shifts and 4f7/2 Lineshapes," D. M. Riffe and G. K. Wertheim, Phys. Rev. B 47, 6672 (1993).