Abstract
Low-energy (10<E 0 <500 EV) HE + ions are employed to explore the mechanism of electron emission from the Cs-saturated W(110) surface. The intense peak at the Fermi level exhibits a marked Doppler shift while a lifetime broadening of the peak is less pronounced than that expected from Auger deexcitation. These findings reveal that the intense electronic emission comes from the incoming trajectories before Auger deexcitation of He * ( 3 S 1 ) takes place
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