Structure of the Si(111)-Ca<span class="aps-inline-formula"><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><msub><mrow><mi mathvariant="normal">F</mi></mrow><mrow><mn>2</mn></mrow></msub></mrow></math></span> Interface

R. M. Tromp; M. C. Reuter

doi:10.1103/PhysRevLett.61.1756

Structure of the Si(111)-Ca $F_{2}$ Interface

R. M. Tromp and M. C. Reuter

Phys. Rev. Lett. 61, 1756 – Published 10 October 1988

Abstract

The structure of the Si(111)-Ca $F_{2}$ interface has been determined with medium-energy ion scattering. Ca bonds to the Si substrate in a geometric arrangement virtually identical to Ca ${Si}_{2}$ . Half of the F atoms at the interface are missing; there is no F-Si bonding and the interface is charge neutral. The structure we find has not been considered previously and provides a natural explanation for the results of published photoemission studies.