Abstract
3H luminescence has been induced in a wide variety of rather pure natural and chemical vapour deposited diamond samples by electron irradiation in an ion-free 300 kV transmission electron microscope, with subsequent annealing in some cases. A few of the irradiations were performed with samples cooled by liquid helium. Subsequent luminescence studies were performed by microscopic photoluminescence spectroscopy at liquid-helium temperatures. The results lead to the conclusion that 3H luminescence arises from the single, isolated, 〈100〉 split self-interstitial in diamond.
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