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- W4230773923 startingPage "1913" @default.
- W4230773923 abstract "Correlated optical and EPR studies have shown that after x or $ensuremath{gamma}$ irradiation and proper thermal treatment, a Br${mathrm{Cl}}^{ensuremath{-}}$ center with a positive-ion vacancy in a nearest-neighbor position to both nuclei of the molecule ion, called $mathrm{Br}{mathrm{Cl}}^{ensuremath{-}}({v}_{+})$, is formed in crystals of KCl doped with small amounts of KBr and Pb${mathrm{Cl}}_{2}$. Prolonged excitation of the high-energy transition of $mathrm{Br}{mathrm{Cl}}^{ensuremath{-}}({v}_{+})$ at 77 K results in the decomposition of this center and the formation of a new center $mathrm{Cl}_{2}^{}{}_{}{}^{ensuremath{-}}({v}_{+})$, a ${mathrm{Cl}}_{2}^{ensuremath{-}}$ with a positive-ion vacancy in a nearest-neighbor position to both nuclei. The internuclear axis of $mathrm{Cl}_{2}^{}{}_{}{}^{ensuremath{-}}({v}_{+})$ lies in a {100} plane and parallel to a 110> direction; however, the molecular bond is bent through an angle of 2.8ifmmode^circelsetextdegreefi{}. The $mathrm{Cl}_{2}^{}{}_{}{}^{ensuremath{-}}({v}_{+})$ center has a strong $ensuremath{sigma}$-polarized transition at 362 nm and a less intense weakly $ensuremath{pi}$-polarized transition near 750 nm; optical excitation at 77 K can cause preferential orientation of these molecule ions. Thermal reorientation of $mathrm{Cl}_{2}^{}{}_{}{}^{ensuremath{-}}({v}_{+})$ occurs in the neighborhood of 111 K; a study of the reorientation kinetics shows that the reorientation takes place by 90ifmmode^circelsetextdegreefi{} and 60ifmmode^circelsetextdegreefi{} jumps." @default.
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- W4230773923 date "1974-02-15" @default.
- W4230773923 modified "2023-09-27" @default.
- W4230773923 title "EPR and optical-absorption study of BrCl−and associated centers in doped KCl Crystals. III" @default.
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- W4230773923 doi "https://doi.org/10.1103/physrevb.9.1913" @default.
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