Abstract
Electron spin resonance has been observed in the lowest optically excited state of the FA(Mg) centre in CaO by detecting FA(Mg)-band phosphorescence peaking at 689 nm. The ODMR spectrum is axially symmetric about the (100) axis; transferred hyperfine structure due to 25Mg(I=5/2) confirms that a nearest-neighbour cation site of the F-centre is occupied by an Mg2+ impurity ion.
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