ELECTRONIC RAMAN AND INFRARED-SPECTRA OF ISOTOPICALLY CONTROLLED BLUEDIAMONDS

We report the first observation of the electronic Raman effect in semi conducting p-type, isotopically controlled diamonds. The Raman transit ion between the spin-orbit split Is ground states of boron accepters o ccurs at Delta' = 2.07(1) and 2.01(1) meV in natural and C-13 diamonds , respectively. Polarization features show the transition to be predom inantly Gamma(5) in character, placing an upper limit on the ratio of the nonspherical Luttinger parameters of the valence band. Host-isotop e-related self-energy shifts are observed in both the electronic infra red and Raman spectra.