We present a near-edge x-ray-absorption investigation on the Pd M4,5 edge of Pd, Pd0.85Al0.15, PdAl, and PdAl3, and on the Ag M4,5 edge of Ag. A comparison with theoretical results for the pure elements Pd and Ag indicates this kind of spectroscopy to be related to the p-projected density of states above the Fermi level via a --> 3d --> 5p dipole allowed excitation. A direct estimation of the Ag M4,5 core-hole life-time width value (0.4 +/- 0.05 eV) is furthermore accomplished. The dramatic changes of the investigated line shapes on going from pure Pd to an increasing dilution of Pd atoms into an AI matrix host suggest a strong participation of the p states to the formation of the chemical bonding which has been undervalued up to now.
Duo, L., Sancrotti, M., Curro, G., Ruocco, A., Daddato, S., Cosso, R., et al. (1993). STRONG EVOLUTION OF THE P-PROJECTED EMPTY DENSITY OF STATES IN PD-AL ALLOYS - AN M4,5 X-RAY-ABSORPTION-SPECTROSCOPY INVESTIGATION. PHYSICAL REVIEW. B, CONDENSED MATTER, 47(12), 6937-6941 [10.1103/PhysRevB.47.6937].
STRONG EVOLUTION OF THE P-PROJECTED EMPTY DENSITY OF STATES IN PD-AL ALLOYS - AN M4,5 X-RAY-ABSORPTION-SPECTROSCOPY INVESTIGATION
RUOCCO, Alessandro;
1993-01-01
Abstract
We present a near-edge x-ray-absorption investigation on the Pd M4,5 edge of Pd, Pd0.85Al0.15, PdAl, and PdAl3, and on the Ag M4,5 edge of Ag. A comparison with theoretical results for the pure elements Pd and Ag indicates this kind of spectroscopy to be related to the p-projected density of states above the Fermi level via a --> 3d --> 5p dipole allowed excitation. A direct estimation of the Ag M4,5 core-hole life-time width value (0.4 +/- 0.05 eV) is furthermore accomplished. The dramatic changes of the investigated line shapes on going from pure Pd to an increasing dilution of Pd atoms into an AI matrix host suggest a strong participation of the p states to the formation of the chemical bonding which has been undervalued up to now.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
