Electronic surface states and the hydrogen dissociation barrier
Surface states contribute significantly to the charge density in front of metal surfaces. Owing to the Pauli principle, this yields a repulsive contribution in the physisorption potential for closed-shell adsorbate particle, such as rare-gases or H(2). In the case of rare-gas adsorption the surface state induced repulsion can be directly measured by means of high-resolution photoemission. The additional repulsive contribution influences also the barrier height in dissociative adsorption. This is demonstrated for f.c.c (111) and f.c.c. (110) surfaces by adjusting the surface state occupancy with a variety of suitable adsorbates and monitoring the associated changes in the dissociation probability of H(2).
Bibliographic Reference: Article: Physica Status Solidi A, Vol, 159 (1997) No. 1, pp. 235-242
Record Number: 199710250 / Last updated on: 1997-04-01
Original language: en
Available languages: en