Low frequency Raman‐active lattice vibrations of n ‐paraffins

1973 ◽  
Vol 59 (1) ◽  
pp. 534-544 ◽  
Author(s):  
Heinz G. Olf ◽  
Bruno Fanconi
Keyword(s):  
Low Frequency ◽  
Lattice Vibrations

Far Infrared Group Frequencies. V. Oximes and Aldoximes

1973 ◽  
Vol 27 (1) ◽  
pp. 22-26 ◽  
Author(s):  
S. M. Craven ◽  
F. F. Bentley ◽  
D. F. Pensenstadler
Keyword(s):  
Hydrogen Bond ◽  
Infrared Spectra ◽  
Low Frequency ◽  
Far Infrared ◽  
Torsional Vibrations ◽  
Lattice Vibrations ◽  
Dilute Solutions ◽  
Solid Samples ◽  
Bending Modes ◽  
Bond Stretch

The low frequency infrared spectra from 450 to 75 cm−1 of seven oximes and five aldoximes have been recorded for pure samples and for dilute solutions in cyclohexane. An intense characteristic band is present in the solution spectra at 367 ± 10 cm−1. This characteristic band shifts to 275 ± 10 cm−1 in the spectra of the OD compounds. The 367 ± 10 cm−1 and 275 ± 10 cm−1 bands are assigned to OH and OD torsional vibrations. A comparison of the solution spectra with spectra of the solid samples indicated that the OH … N hydrogen bond stretch of oximes and aldoximes occurs in 300 to 200 cm−1 region. Strong bands also are present in 140 to 100 cm−1 region which are due to OH … N bending modes or perhaps lattice vibrations.

Calculation of NQR v's and T1-1' s being proportional to T4 and T5 , respectively

1990 ◽  
Vol 45 (3-4) ◽  
pp. 536-540
Author(s):  
Mariusz Máckowiak ◽  
Costas Dimitropoulos
Keyword(s):  
Temperature Dependence ◽  
Relaxation Rate ◽  
Spin System ◽  
Low Frequency ◽  
Lattice Relaxation ◽  
Spin Lattice Relaxation ◽  
Lattice Vibrations ◽  
Spin Lattice ◽  
Simplifying Assumptions ◽  
The One

Abstract The second-order Raman phonon process for a multilevel spin system is shown to give a quadru-polar spin-lattice relaxation rate T1-1varying as T5 at very low temperatures. This relaxation rate for quadrupole spins is similar to the one discussed for a paramagnetic spin system having a multilevel ground state. The temperature dependence of T1 is discussed on the basis of some simplifying assumptions about the nature of the lattice vibrations in the Debye approximation. This type of relaxation process has been observed below 20 K in tetramethylammonium hydrogen bis-trichloroacetate for the 35Cl T1-1 . Below 20 K the NQR frequency in the same crystal reveals a T4 temperature dependence due to the induced modulations of the vibrational and librational coordinates by the low-frequency acoustic phonons.

Skeletal and Lattice Vibrations of Crystals of Dihalogenobis(pyridine)zinc(II)

1974 ◽  
Vol 52 (11) ◽  
pp. 2005-2015 ◽  
Author(s):  
P. T. T. Wong
Keyword(s):  
Single Molecule ◽  
Room Temperature ◽  
Normal Modes ◽  
Low Frequency ◽  
Far Infrared ◽  
Liquid Nitrogen Temperature ◽  
Lattice Vibrations ◽  
Individual Molecule ◽  
Stretching Vibrations ◽  
The Individual

Detailed measurements of the low-frequency Raman spectra of the crystals of [ZnPy2Cl2] and [ZnPy2Br2] at room temperature, where Py is the pyridine molecule, and the far-infrared spectrum of the crystal of [ZnPy2Cl2] at liquid nitrogen temperature have been made. The vibrational frequencies for the single molecule and for the complete crystal of these two complexes have been calculated and compared with the observed spectra, and the distribution of the potential energy of the normal modes has also been calculated to assist the refinement of the calculation and the interpretation of the spectra. Apparently, the skeletal Zn–ligand vibrations of the individual molecule couple with the lattice vibrations in the crystal, except for the normal modes at 326 cm−1 for [ZnPy2Cl2] and at 250 cm−1 for [ZnPy2Br2] which are dominated by the Zn–halogen stretching vibrations. Reasonably good Zn–ligand stretching force constants were obtained. The nature of the coordination bonds of these complexes has been discussed.

SOME SCATTERING PROBLEMS IN CONDUCTION THEORY

1957 ◽  
Vol 35 (4) ◽  
pp. 441-450 ◽  
Author(s):  
P. G. Klemens
Keyword(s):  
Lattice Thermal Conductivity ◽  
Stacking Faults ◽  
Low Frequency ◽  
Thermal Resistivity ◽  
Lattice Vibrations ◽  
Scattering Problems ◽  
Strain Fields ◽  
Inhomogeneous Strain ◽  
Lattice Waves ◽  
Conduction Theory

An expression is derived for the scattering of electrons by inhomogeneous strain fields in terms of the scattering of electrons by low frequency lattice vibrations, as deduced from the low temperature intrinsic thermal resistivity and the lattice thermal conductivity. This is applied to the scattering of electrons by dislocations and stacking faults. An expression for the scattering of lattice waves by stacking faults is also derived. The validity of these results is discussed.

Low-frequency optical spectra of lattice vibrations of the Hg1−x ZnxTe alloy

2007 ◽  
Vol 49 (12) ◽  
pp. 2307-2311 ◽  
Author(s):  
S. P. Kozyrev ◽  
I. V. Kucherenko ◽  
M. Cestelli Guidi ◽  
R. Triboulet
Keyword(s):  
Low Frequency ◽  
Optical Spectra ◽  
Lattice Vibrations

Ultrafast carrier dynamics in BiVO4 thin film photoanode material: interplay between free carriers, trapped carriers and low-frequency lattice vibrations

2016 ◽  
Vol 4 (47) ◽  
pp. 18516-18523 ◽  
Author(s):  
K. T. Butler ◽  
B. J. Dringoli ◽  
L. Zhou ◽  
P. M. Rao ◽  
A. Walsh ◽  
...  
Keyword(s):  
First Principles ◽  
Terahertz Spectroscopy ◽  
Low Frequency ◽  
Carrier Dynamics ◽  
Vibrational Modes ◽  
Lattice Vibrations ◽  
Time Resolved ◽  
Ultrafast Carrier Dynamics ◽  
Free Carriers ◽  
Ultrafast Carrier

We explore ultrafast carrier dynamics and interactions of photoexcited carriers with lattice vibrational modes in BiVO4 using time-resolved terahertz spectroscopy and first-principles phonon spectrum calculations.

Low-frequency lattice vibrations in β-alumina

1981 ◽  
Vol 2 (1) ◽  
pp. 47-52 ◽  
Author(s):  
T HATTORI ◽  
H NAKATA ◽  
T IMANISHI ◽  
H KUROKAWA ◽  
A MITSUISHI
Keyword(s):  
Low Frequency ◽  
Lattice Vibrations
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