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A type IIa natural diamond was irradiated at room temperature with energetic electrons. The threshold energy for displacement of atoms from their lattice sites was determined for three principal crystallographic directions by observing the formation of defect clusters during irradiation in a transmission electron microscope. The displacement-threshold energies were found to be 37.5±1.2 eV for the electron incident in the 100 direction, 45.0±1.3 eV in the 111 direction, and 47.6±1.3 eV in the 110 direction.
Koike et al. (Mon,) studied this question.