Impurity-Induced Far-Infrared Absorption in KBr and KCl

Ward, Robert W.; Timusk, T.

doi:10.1103/physrevb.5.2351

Cited by 28 publications

(3 citation statements)

References 49 publications

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“…. 140 [4][5][6][7][8][9][10][11][12][13][14] Transmission spectra (30 to 90 cm-1) of PLA and L-alanine oligomers at 300'K.. . Good agreement is obtained between this value and previous theoretical calculations of the GrUneisen constant.…”

Section: -5mentioning

confidence: 99%

“…The broad impurity -8-induced absorption in RbI and RbBr is expected to be indicative of the density of states of the pure crystal. 14,28 In Appendix B far infrared measurements on miscellaneous organic compounds are reported. The observed features are consistent with the interpretation that crystalline structure is necessary to obtain narrow far infrared absorption lines.…”

Section: Plan Of the Thesismentioning

confidence: 99%

“…The U-center anharmonicity in KBr determined in this fashion is found to be nearly that of the bulk crystal. This information can then be 13,14 used to check the anharmonic content of the bulk lattice potential models used to describe these phonons. 15 Th e quantity which describes this anharmonicity is the Grlineisen constant y.…”

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confidence: 99%

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Temperature and hydrostatic pressure dependence of the U-center and the far infrared properties of polyamino acids

Shotts

1973

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Section: -5mentioning

confidence: 99%

Section: Plan Of the Thesismentioning

confidence: 99%

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Temperature and hydrostatic pressure dependence of the U-center and the far infrared properties of polyamino acids

Shotts

1973

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The effect of monovalent impurities on KCl low‐temperature specific heat

Augst

Kvavadze

1975

Physica Status Solidi (b)

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An enhancement of the specific heat of KCl crystals doped with Ag+ and Na+ impurities in the temperature range 5 to 30 K is observed. A comparison of the experimental results with the theory shows that in the case of Ag+ the force constants (FC) are weakened by four times. Theestablished quasi-local frequency (QLF) is close to that found in experiments of infrared absorption. The anomalous increase of the low-temperature specific heat of the KC1 crystals withlight substitutional Na+ impurities are ascribed to the vibration of isolated ions with FC weakened 2.5 times.

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FIR Studies of OCN⁻, SCN⁻, and SeCN⁻ Centre Gap Modes in KI Single Crystals

Otto

Fischer

1984

Physica Status Solidi (b)

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Several sharp absorption lines within the frequency range of t.he phonon gap of KI are shown to be due t o the ehalcogcnocyanate ecntres. A resonance mode occuring near the low-frequency gap boundary is also ascribed to the SeCK-centre. The experimental data are compared with a threedimensional model calculation for a monoatomic isotopic impurity centre and with a simple model for the centre of a linear molecular ion. A characterization of the gap and resona.nce modes is given. Mehrere scharfc L4bsorpiionslinien im Frequenzbereich des Phononengaps von K J werden alsModcn der Chalkogenozyanatzentren idcntifiziert,. Eine Resonanzxuode nahe der untcren Gapgeiize wird dem SeC'X--%cntrum zugeschrieben. Die experimentellen Egebnisse werden mit ciner dreidimensionalen Modellrechnung fur ein einatomiges, isotopes St.ijrzent.rum und mit einem einfachen Modell fur das Zentrum eines linearen Nolekuls verglichen. Es wird eine Charakteriaieruug der Gap-und Itesonanzmoden gegeben.

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Impurity-Induced Far-Infrared Absorption in KBr and KCl

Cited by 28 publications

References 49 publications

Temperature and hydrostatic pressure dependence of the U-center and the far infrared properties of polyamino acids

Temperature and hydrostatic pressure dependence of the U-center and the far infrared properties of polyamino acids

The effect of monovalent impurities on KCl low‐temperature specific heat

FIR Studies of OCN⁻, SCN⁻, and SeCN⁻ Centre Gap Modes in KI Single Crystals

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Impurity-Induced Far-Infrared Absorption in KBr and KCl

Cited by 28 publications

References 49 publications

Temperature and hydrostatic pressure dependence of the U-center and the far infrared properties of polyamino acids

Temperature and hydrostatic pressure dependence of the U-center and the far infrared properties of polyamino acids

The effect of monovalent impurities on KCl low‐temperature specific heat

FIR Studies of OCN−, SCN−, and SeCN− Centre Gap Modes in KI Single Crystals

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Product

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FIR Studies of OCN⁻, SCN⁻, and SeCN⁻ Centre Gap Modes in KI Single Crystals