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- W2003993051 abstract "The stress-induced linear dichroism in the absorption of the $F$ center in KCl and the $U$ center in KBr has been measured in the range from 7 to 120ifmmode^circelsetextdegreefi{}K. The moments analysis of Henry, Schnatterly, and Slichter has been used to interpret the results. For the $F$ center, a measurement of the changes in the third moment of the $F$ band allows the determination of the separate contributions to the second moment by lattice vibrations of $ensuremath{Gamma}_{1}^{}{}_{}{}^{+}$, $ensuremath{Gamma}_{3}^{}{}_{}{}^{+}$, and $ensuremath{Gamma}_{5}^{}{}_{}{}^{+}$ symmetry. Within the harmonic approximation, the temperature dependence of these separate contributions defines an average vibrational frequency for each symmetry mode broadening the band. The measured frequencies, ${ensuremath{omega}}_{1}=2.3ifmmodepmelsetextpmfi{}0.1ifmmodetimeselsetexttimesfi{}{10}^{13}$ ${mathrm{sec}}^{ensuremath{-}1}$, ${ensuremath{omega}}_{5}=1.95ifmmodepmelsetextpmfi{}0.1ifmmodetimeselsetexttimesfi{}{10}^{13}$ ${mathrm{sec}}^{ensuremath{-}1}$, and ${ensuremath{omega}}_{3}=1.4ifmmodepmelsetextpmfi{}0.1ifmmodetimeselsetexttimesfi{}{10}^{13}$ ${mathrm{sec}}^{ensuremath{-}1}$, lie in the acoustic and low-frequency optical region of the host-lattice vibrational spectrum. The stress response for the $U$ center was found to be qualitatively identical to that of the $F$ center. The changes in the first moment of the $U$ band determine the excited-state coupling to unit strains of $ensuremath{Gamma}_{3}^{}{}_{}{}^{+}$ and $ensuremath{Gamma}_{5}^{}{}_{}{}^{+}$ symmetry. From the changes in the third moment, it was found that cubic vibrations dominate the broadening of the $U$ band. A broad peak in the dichroism pattern to the high-energy side of the $U$ band is interpreted as evidence for transitions to higher excited states of the $U$ center analogous to the $K$-band transitions associated with the $F$ center." @default.
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- W2003993051 date "1969-12-15" @default.
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- W2003993051 title "Effects of Uniaxial Stress on the Absorption of theFCenter in KCl and theUCenter in KBr" @default.
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- W2003993051 doi "https://doi.org/10.1103/physrev.188.1392" @default.
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