Abstract
Electron paramagnetic resonance (EPR) measurements on natural citrine and greenish-yellow quartz revealed the presence of several localized hole centers adjacent to an aluminium impurity. The g tensors and their principal axes directions were determined for the two most prominent centers. The g-tensor variations and 27Al hyperfine splittings are roughly half as large as for the well-known smoky quartz centers. Optical and infrared absorption, thermal stability and thermoluminescence were also studied. In these citrine centers an additional defect must be present in the immediate neighborhood of the hole, but the exact nature of this defect is still unknown.
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Maschmeyer, D., Niemann, K., Hake, H. et al. Two modified smoky quartz centers in natural citrine. Phys Chem Minerals 6, 145–156 (1980). https://doi.org/10.1007/BF00311051
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DOI: https://doi.org/10.1007/BF00311051