Key points are not available for this paper at this time.
Measurements of high-resolution photoemission-energy distributions have been extended beyond 11. 6 eV (LiF-window cutoff) for Cu, Ag, and Au. Surprisingly sharp structure (0. 3 eV, i. e. , resonance 50) is resolved at these high energies. These new results show d-band widths of 3. 0, 3. 5, and 5. 7 eV for Cu, Ag, and Au, respectively, and show dramatic evidence (nonstationary structure and amplitude effects) for direct transitions.
East̀man et al. (Mon,) studied this question.