Acceptorlike excited states of the isoelectronicA,B,Cexciton system in silicon

Excitation spectroscopy of the isoelectronic $A$, $B$, $C$ exciton system in silicon yields seven new excited states. They can be associated with excited hole states of an effective-mass-like pseudoacceptor split in the axially symmetric field of the binding center. The pseudoacceptor ($E_i=36.7\mathrm{}$ meV) fits excellently into the systematics of common acceptor spectra in silicon.