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  • 1
    Electronic Resource
    Electronic Resource
    Rotational diffusion in methyl iodide: Bandshape analysis of degenerate vibrational modes (1989)
    Chichester [u.a.] : Wiley-Blackwell
    Journal of Raman Spectroscopy 20 (1989), S. 339-343 
    Details
    ISSN: 0377-0486
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The Raman spectral bandshapes of the ν1(A1), ν3(A1) and ν4(E) vibrations of CH3I were studied as a function of temperature in the liquid phase. Perpendicular diffusion coefficients calculated from ν3 agreed well with earlier reported results. The degenerate CH3 stretching vibration, ν4, was analyzed via fitting by a model incorporating two Lorentzian lineshapes. Values of the parallel diffusion constants, D∥, determined using only the narrower component were in excellent semi-quantitative agreement with those predicted by the free rotor model of molecular reorientation. Analysis of the room-temperatur Raman spectrum of ν5(E) yielded the same value of D∥ as that calculated from ν4. The room-temperature infrared spectral intensities of ν5 were fitted by a model with a narrow Lorentzian containing contributions from rotational and vibrational relaxation superposed on a second component introduced to account for the broad background absorption. D∥ determined from the IR bandwidth was in good agreement with values obtained from the Raman spectra of ν4 and ν5. These results demonstrate the utility of analyzing degenerate vibrational modes to determine the parallel diffusion coefficients in C3v molecules.
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jrs.1250200510
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  • 2
    Electronic Resource
    Electronic Resource
    Raman study of temperature-induced phase transitions in lead hafnate (PbHfO3) (1994)
    Chichester [u.a.] : Wiley-Blackwell
    Journal of Raman Spectroscopy 25 (1994), S. 331-334 
    Details
    ISSN: 0377-0486
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Results of a high-temperature Raman spectroscopic investigation up to 522 K carried out at ambient pressure on an antiferroelectric PbHfO3 multi-domain single crystal are reported. The changes in the Raman spectral features show that temperature-induced phase transitions occur at 435 ± 1 and at 484 ± 1 K. The first transition is possibly to a tetragonal structure and the second is to the cubic perovskite phase. The behavior is consistent with the earlier x-ray study of PbHfO3. No soft mode behavior associated with the transitions was detected in the Raman spectra of PbHfO3. The changes observed in the high-temperature Raman spectra of PbHfO3 are similar to those found in the spectra of isostructural PbZrO3.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jrs.1250250508
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    High-pressure Raman study of SrMoO4 up to 37 GPa and pressure-induced phase transitions (1995)
    Chichester [u.a.] : Wiley-Blackwell
    Journal of Raman Spectroscopy 26 (1995), S. 451-455 
    Details
    ISSN: 0377-0486
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Pressure-induced phase changes in SrMoO4 were investigated by high-pressure Raman spectroscopy in a diamond anvil cell. The scheelite-type SrMoO4 transforms in to a monoclinic lattice near 13 GPa and retains this structure up to 37 GPa, the limit of pressure tested. There is no pressure-induced amorphization in this simple molybdate up to this pressure, as in the case of structurally complex molybdate systems. The optical absorption characteristics of SrMoO4 change considerably with pressure, the sample turning progressively deep orange-brown with increase in pressure. This change is connected with the lowering of the d-state of molybdenum in the MoO4 ion with increase in pressure.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jrs.1250260609
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Solvent dependence of 13C relaxation times and reorientational dynamics in tribromobenzene (1988)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 26 (1988), S. 675-678 
    Details
    ISSN: 0749-1581
    Keywords: Tribromobenzene ; 13C spin-lattice relaxation times ; correlation times ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The 13C spin-lattice relaxation times and nuclear Overhauser enhancements of protonated carbons in 1, 3, 5-tribromobenzene were measured in a number of solvents of widely varying viscosity, Derived reorientational correlation times were found to increase approximately linearly with solution viscosity, as predicted by hydrodynamic theories of rotational diffusion.Rotational correlation times calculated from the perrin stick model were two to three times longer than the measured τc values. Similarly, correlation times predicted by the Hu-Zwanzig slip model were too small by a factor of two. On the other hand, application of the newer Hynes-Kapral-Weinberg theory furnished reorientational correlation times that were in virtually quantitative agreement with the experimental results.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mrc.1260260807
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    Paper (German National Licenses)
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