EXACT CALCULATIONS OF THE DYNAMIC FORM-FACTOR OF HYDROGEN CHEMISORBED ON A TRANSITION-METAL WITH ONE-ELECTRON OR HOLE IN THE ENERGY-BAND

The dynamic form factor S(a)(omega) of hydrogen chemisorbed on a transition metal with one electron or hole in the energy band is calculated exactly for the Anderson-Newns model. The influence of the electron correlation effects on S(a)(omega) is studied in different regions of the parameter space and the nature of the hydrogen-induced electron-energy losses is discussed. The functions S(a)(omega) are calculated for the sets of parameters, imitating hydrogen chemisorption on Ni and Pd, and the results are compared with measured electron-energy-loss spectra of the H/Ni adsorption system.