Abstract
The effects of isotope disorder on the energies of the transverse acoustic (TAL), longitudinal acoustic (LAL) and transverse optical (TOL) phonons at the L point have been investigated using the luminescence of excitons bound to copper acceptors. In a sample with approximately equal 70Ge and 78Ge the TOL phonon is 0.14+or-0.03 meV higher in energy than expected for a crystal of the same mean atomic mass, while the LAL phonon is 0.07+or-0.03 meV lower in energy; the TOL phonon is also broadened by 0.4 meV. In this disordered sample the Cu no-phonon line is 0.05+or-0.02 meV higher than expected.
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