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- W2000585870 abstract "The general considerations about the vibrational absorption of tunneling molecules, developed in Paper I of this work, are applied and tested, using ${mathrm{CN}}^{ensuremath{-}}$ defects in KCl. In previous work on this system the vibrational absorption of ${mathrm{CN}}^{ensuremath{-}}$ was reported to be strongly broadened by an unresolved tunneling splitting, and to show pure zero-moment changes under applied stress. The tunneling model, however, predicts additionally characteristic anisotropic changes of the spectral shape under applied field or stress for any absorption, broadened by orientational tunneling. A thorough experimental reinvestigation of this system at low temperatures yields results which agree with the predictions from the tunneling model. For low ${mathrm{CN}}^{ensuremath{-}}$ concentration, the first- and second-harmonic vibrational absorption (at 5 and 2.5 ensuremath{mu}m) consists of a resolved double structure, caused by the reorientational tunneling of the molecule in the crystal (tunneling splitting $ensuremath{Delta}=1.2$ ${mathrm{cm}}^{ensuremath{-}1}$). The application of uniaxial stress of different symmetry is found to produce two basic effects: Second-moment absorption changes (due to quantum-mechanical mixing of the tunneling states by the stress), and zero-moment changes (due to classical elastic dipole alignment). The observed pronounced anisotropy of these effects yield both independently a (cigar-shaped) 111> elastic dipole model. These results disagree with the (pancake-shaped) 100> elastic dipole, derived from the earlier elastooptical work, which has been the basis of the so far generally accepted 100> defect model. Consequences of this symmetry change for the interpretation of several previous investigations on KCl:C${mathrm{N}}^{ensuremath{-}}$ will be discussed." @default.
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- W2000585870 date "1974-10-15" @default.
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- W2000585870 title "Vibrational absorption of tunneling molecular defects in crystals. II. Tunneling molecules under applied stress (KCl:CN−)" @default.
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- W2000585870 doi "https://doi.org/10.1103/physrevb.10.3677" @default.
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