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OPTICAL STUDIES ON DIAMOND
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abrasion absorption absorption spectrum axis bonded Bragg Burgers vector calculated carbon atoms centre cleavage coefficient conduction conduction band corresponding crystal cube face cube plane curve defects density depth diamond surface diamonds show diffraction dislocation dodecahedron edge effect electron electron spin resonance emission energy etch pits experimental experiments friction G band germanium graphite growth hardness heat IIb diamonds impurity infrared intensity interstitial ionized irradiation Kemmey lattice lattice constant layer lines load Lond measurements natural diamonds neutron nitrogen observed obtained occur octahedral octahedron face optical orbital orientation parallel paramagnetic pattern Phaal phonon Phys platelets polished pressure Proc produced projection topographs properties reflexions region resonance ring cracks room temperature scattering shown in figure specimen spectra spectrum spike spin stone structure suggested symmetry synthetic diamonds tensile stress thermal Tolansky trigons type I diamonds type IIb ultraviolet vacancy valence band variation wavelength wheel X-ray