Abstract

The EPR centre W36, found in natural type IIb diamond, has beenpreviously attributed to a boron-related point defect, largely on account ofits four line hyperfine structure attributed to 11B. The attribution has beenre-examined, and no simple boron-related site has been found capable ofaccounting for the measured parameters. It is concluded that W36 is much morelikely to be related to copper, probably at a semi-vacancy site (C3VCuVC3)+.An unusual feature of this centre is the very small value of the finestructure parameter D. Two other centres, W10 and W32, with similarly smallvalues of D, which may also be associated with 3d ions, are briefly discussed.

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