Abstract
We report high-resolution cathodoluminescence (CL) measurements near the indirect gap of isotopically modified diamonds. From the energies of intrinsic phonon-assisted peaks, as well as the no-phonon recombination of boron-bound excitons, we determine the contribution of isotope disorder to the frequencies of various phonons with nonzero wave vector. The results confirm calculations of the phonon self-energy based on ab-initio lattice dynamics. For some modes we predict an asymmetric variation of the disorder-induced shift with the 13C concentration which is observed in second-order Raman spectra. The no-phonon emission from boron-bound excitons (D 0 and D 0 ′ lines) exhibits a fine structure which arises from a splitting of the neutral boron acceptor ground state (2 meV) and the initial bound excitons (3.3 meV). When varying the 13C content all components shift with a slope of (14.6 ± 0.5) meV/amu.
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