q qa qf qk qn qq qr qs qt qu qw qz

Перевод: quencher

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Тезаурус:

1. However, there is no guarantee that activator or quencher elements will always have the same effect in different minerals; for example, Fe 2 + is an activator in some feldspars, despite the quenching activity of Fe in calcite.
2. For example, Mn 2 + is the main activator causing luminescence in calcite, whereas Fe2 + is a quencher in the same mineral.
3. At the very least, the precaution of staining thin sections with Alizarin Red S and potassium ferricyanide (Chapter 4) is required as a rapid and sensitive method of determining whether variation in CL intensity is likely to be due to fluctuations in Mn activator or to the presence of Fe as a quencher.
4. Activator and quencher ions may produce their effects at extremely low concentrations, below the detection limits of the electron microprobe.
5. In geological materials, luminescence is commonly controlled by the balance of activator and quencher centres.
6. Quencher centres: where even the excited state of the centre is close to a radiationless transition level, so little or no luminescence is emitted.
7. Fe 2 + is the commonest quencher ion, but Ni 2 + has a similar effect.