Temperature-Dependent Low-Frequency Vibrations of Thiamine Crystal Containing Hydrated Ions

2021 ◽  
Vol 125 (9) ◽  
pp. 1837-1844
Author(s):  
Masae Takahashi ◽  
Mitsuru Kowada ◽  
Hiroshi Matsui ◽  
Eunsang Kwon ◽  
Yuka Ikemoto
Keyword(s):  
Low Frequency ◽  
Temperature Dependent ◽  
Hydrated Ions

Interpretation of temperature-dependent low frequency vibrational spectrum of solid-state benzoic acid dimer

2009 ◽  
Vol 479 (4-6) ◽  
pp. 211-217 ◽  
Author(s):  
Masae Takahashi ◽  
Yoshiyuki Kawazoe ◽  
Yoichi Ishikawa ◽  
Hiromasa Ito
Keyword(s):  
Solid State ◽  
Vibrational Spectrum ◽  
Benzoic Acid ◽  
Low Frequency ◽  
Temperature Dependent

Temperature Dependent Raman Scattering in CsTiOAsO4 Single Crystal

1995 ◽  
Vol 398 ◽  
Author(s):  
A.R. Guo ◽  
C.-S. Tu ◽  
Ruiwu Tao ◽  
R.S. Katiyar ◽  
Ruyan Guo ◽  
...  
Keyword(s):  
Soft Mode ◽  
Low Frequency ◽  
High Mobility ◽  
Vibrational Modes ◽  
Frequency Range ◽  
Temperature Dependent ◽  
Higher Symmetry ◽  
Phonon Spectra ◽  
Symmetry Structure ◽  
Increasing Temperature

ABSTRACTThe longitudinal (LO) and transverse (TO) A1 vibrational modes have been measured between 30-1200 cm−1 as a function of temperature (30–1240 K) for CsTiOAsO4 (CTA). The frequencies for all corresponding Raman components shifted to lower frequencies on increasing the temperature, however, there is no typical soft-mode like behavior observed in the measured frequency range. The relative intensities of the low frequency bands increase dramatically with increasing temperature due to high mobility of Cs+ ion. A higher symmetry structure taking place above 940K has been confirmed by changes in the phonon spectra.

scholarly journals Temperature dependence of the vibrational spectrum of porphycene: a qualitative failure of classical-nuclei molecular dynamics

2020 ◽  
Vol 221 ◽  
pp. 526-546 ◽  
Author(s):  
Yair Litman ◽  
Jörg Behler ◽  
Mariana Rossi
Keyword(s):  
Molecular Dynamics ◽  
Vibrational Spectrum ◽  
Temperature Dependence ◽  
High Frequency ◽  
Quantum Dynamics ◽  
Low Frequency ◽  
Blue Shift ◽  
Temperature Dependent ◽  
Vibrational Coupling ◽  
Thermally Activated

Approximate quantum dynamics succeed in predicting a temperature-dependent blue-shift of the high-frequency stretch bands that arise from vibrational coupling between low-frequency thermally activated modes and high-frequency quantized ones. Classical nuclei molecular dynamics fail and instead predict a red-shift.

Temperature-dependent coupling of low frequency adsorbate vibrations to metal substrate electrons

1996 ◽  
Vol 205 (1-2) ◽  
pp. 159-166 ◽  
Author(s):  
J.P. Culver ◽  
M. Li ◽  
Z.-J. Sun ◽  
R.M. Hochstrasser ◽  
A.G. Yodh
Keyword(s):  
Low Frequency ◽  
Metal Substrate ◽  
Temperature Dependent

Some Rationale for the Unusual Behavior of the Dielectric Constant of Cu2O

1973 ◽  
Vol 51 (6) ◽  
pp. 680-685 ◽  
Author(s):  
F. L. Weichman
Keyword(s):  
Dielectric Constant ◽  
High Frequency ◽  
Low Temperatures ◽  
Low Frequency ◽  
Depletion Layer ◽  
Temperature Dependent ◽  
Unusual Behavior ◽  
Temperature Variations ◽  
Very Low Frequency ◽  
Semiconducting Material

The very low frequency dielectric constant in Cu2O varies over wide limits and is highly temperature dependent. At sufficiently low temperatures the dielectric constant for all samples reduces to the high frequency value of about 7.5. Small variations in the high frequency value are easily explained as being due to the known presence of copper crystals embedded in the semiconducting material. The low frequency and temperature variations will be related to the variation in the depletion layer formed around each copper inclusion. Calculations are based on highly oversimplified size, shape, and distribution of the copper inclusions.

scholarly journals 1/fNoise from Glauber Dynamics: Self-Consistent Interaction and Temperature Dependent Correlations

2015 ◽  
Vol 2015 ◽  
pp. 1-10 ◽  
Author(s):  
Amrit De
Keyword(s):  
Flicker Noise ◽  
A Priori ◽  
Low Frequency ◽  
Glauber Dynamics ◽  
Glauber Model ◽  
Temperature Dependent ◽  
Spatially Extended ◽  
Two Level Systems ◽  
Ferromagnetic Interactions ◽  
Log Normal

Low frequency flicker noise has been argued to occur in spatially extended metastable systems near a critical point (Bak et al., 1987). An Ising-Glauber model based method is suggested here to systematically obtain temperature dependentnth-order correlation functions forNarbitrary interacting two-level systems (TLSs). This model is fully consistent with existing methods to calculate1/fnoise spectra from TLSs and complements them. However, with as such noa prioriassumptions on the typical log normal distribution of fluctuation rates, it is shown that1/fαnoise manifests in two different cases: first in the thermodynamic limit on a 2D lattice with long range antiferromagnetic interactions at low temperatures and second in the case of a statistical ensemble of finite-sized spin clusters representing disorder, but where each cluster is ordered due to ferromagnetic interactions.

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