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• W1973387741 abstract "Through a combined electron paramagnetic resonance (EPR) and optical-absorption investigation, it is shown that the ${H}_{A}({mathrm{Li}}^{+})$ interstitial center in KCl: ${mathrm{Li}}^{+}$ exhibits two well-defined motions, the pyramidal motion (P. M.) and the restricted interstitial motion (R. I. M.). The P. M. possesses ${C}_{4v}$ symmetry around 100>: The ${mathrm{Cl}}_{2}^{ensuremath{-}}$ jumps around a given 100> direction among the four {110} half-planes. This thermally activated motion is responsible for the disorientation temperature ${T}_{D}(mathrm{P}.mathrm{M}.)=23.5$ K, around which all optical anisotropy produced at 4.2 K with 110> polarized light disappears, and for the lifetime broadening of the EPR lines above ${T}_{mathrm{LB}}(mathrm{P}.mathrm{M}.)=75$ K. The P. M. is basically the same as the reorientation motions of the $H$ and ${H}_{{A}^{ensuremath{'}}A}$ centers. The R. I. M. possesses ${C}_{3v}$ symmetry around 111>: The interstitial Cl exchanges molecular bonds with the three substitutional ${mathrm{Cl}}^{ensuremath{-}}$ ions that surround it. This motion is very similar to the ${V}_{K}$-center reorientation process. The thermally activated R. I. M. is responsible for the broadening of the EPR lines above ${T}_{mathrm{LB}}(mathrm{R}.mathrm{I}.mathrm{M}.)=29$ K, and at 75 K a motionally averaged ${mathrm{Cl}}_{4}^{3ensuremath{-}}$ EPR pattern of ${C}_{3v}$ symmetry is indeed observed. However, in the optical-anisotropy measurements no ${T}_{D}(mathrm{R}.mathrm{I}.mathrm{M}.)$ is observed. It is concluded that the R. I. M. does not freeze in at low temperatures but goes over into a tunneling motion. As a result no optical anisotropy can be produced at 4.2 K with 100> polarized light. No differences have been observed so far for the R. I. M. and the P. M. between ${H}_{A}(^{6}mathrm{Li}^{+})$ and ${H}_{A}(^{7}mathrm{Li}^{+})$. A few comments are also made on the ${H}_{A}({mathrm{Na}}^{+})$ center in KCl: ${mathrm{Na}}^{+}$." @default.
• W1973387741 created "2016-06-24" @default.
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• W1973387741 date "1972-06-15" @default.
• W1973387741 modified "2023-10-16" @default.
• W1973387741 title "Reorientation Motions of the<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mrow><mml:msub><mml:mrow><mml:mi>H</mml:mi></mml:mrow><mml:mrow><mml:mi>A</mml:mi></mml:mrow></mml:msub></mml:mrow><mml:mo>(</mml:mo><mml:mrow><mml:msup><mml:mrow><mml:mi mathvariant=normal>Li</mml:mi></mml:mrow><mml:mrow><mml:mo>+</mml:mo></mml:mrow></mml:msup></mml:mrow><mml:mo>)</mml:mo></mml:math>Center in KCl:<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline…" @default.
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• W1973387741 doi "https://doi.org/10.1103/physrevb.5.4970" @default.
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