## Temperature dependence of lattice resonant modes |

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### Contents

Experimental Equipment and Results | 7 |

The MitaniTakenoSievers Model | 50 |

Anharmonlc Coupling to Band Modes | 68 |

5 other sections not shown

### Common terms and phrases

A. J. Sievers Absorption Coefficient versus absorption due active resonant mode anharmonic anharmonic terms antiferromagnetic approximation assumed Bilz bolometer calculated from Eq CALL LINEPLOT Change in Resonant Coefficient versus Frequency cryostat Debye model determined electronic transition europium experimental force constant frequency shift frequency versus temperature Hamiltonian host lattice I. G. Nolt impurities per cm integrated absorption strength interferometer ions isotope KBr:Li KBr:LiBr KI:AgI lattice constant lattice phonons lattice resonant mode linearly linewidth low temperature MnF2:Eu mode is coupled nearest neighbor non-optically active resonant optically active perturbation theory phonon decay contribution Phys plot quadratic coupling quency rare earth Resonant Frequency versus resonant mode absorption sample temperature Schematic shown in Figure sidebands simple harmonic oscillator Solid curve spectrum static stress stress coefficients symmetry Takeno temperature dependence Temperature for KBr:Li^Br thermal conductivity three resonant modes three systems tion uniaxial stress measurements width zero phonon line