PHOTOEMISSION FROM THE 2P CORE OF SURFACE DIMERS ON SI(100)

Hartree-Fock calculations have been made for a Si2H4 cluster, which simulates a surface dimer on Si(100), for its ground and (2p) core-ionized states as a function of the tilt angle of the dimer. The final state interaction causes a correlated distribution of dangling bond electrons with a given core hole. The result shows the possibility of observing a single surface peak in the core emission spectrum, even if the ground state is a buckled dimer.