Abstract
We have calculated normal photoemission spectra of Cu(110) for both spin-orbit interaction neglected and included. Our results show that the occurrence of a nonrelativistically forbidden transition of type ${\ensuremath{\Sigma}}_{2}\ensuremath{\rightarrow}{\ensuremath{\Sigma}}_{1}$ in recent experimental photoemission data of Goldmann et al. is primarily a relativistic effect. It is related to a relaxation of the nonrelativistic dipole selection rules which is caused by spin-orbit interaction. Our results prove that in photoemission relativistic effects may be important even for elements of low atomic number and may dominate effects due to finite instrumental resolution.
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