Abstract

In this talk we present the first observation, to our knowledge, of short-lived surface resonance states on metal surfaces using two-photon photoemission (2PPE) spectroscopy. In particular, we have measured the photoemission spectra from surface resonances resulting from strong mixing of an image potential (IP) state, with a bulk energy band. In contrast to an IP state which is formed by an electron reflecting between the Coulombic and the crystal barrier, an image resonance is formed by reflection between the same surface Coulombic barrier and an inner discontinuity in the surface potential. Although several papers have investigated these resonances theoretically,1 the only experimental observations have used inverse photoemission,2 with its relatively low resolution. With the higher resolution of 2PPE we were able to resolve the IP feature of Cu (110) and establish that it contains contributions of several broadened IP states. Our success in resolving the resonant IP states is important for further theoretical development.

© 1993 Optical Society of America

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