Temperature dependence and pressure dependence of the vibrational properties of corannulene

2008 ◽  
Vol 245 (10) ◽  
pp. 2261-2263 ◽  
Author(s):  
Laurent Alvarez ◽  
Rozenn Le Parc ◽  
Vincent Jourdain ◽  
Samuel Dennler ◽  
Jean Louis Bantignies ◽  
...  
Keyword(s):  
Temperature Dependence ◽  
Pressure Dependence ◽  
Vibrational Properties

Temperature Dependence of the Intervalley Deformation Potential of GaAs/AlAs Superlattices Under Hydrostatic Pressure

1997 ◽  
Vol 499 ◽  
Author(s):  
S. Guha ◽  
Q. Cai ◽  
M. Chandrasekhar ◽  
H. R. Chandrasekhar ◽  
Hyunjung Kim ◽  
...  
Keyword(s):  
Hydrostatic Pressure ◽  
Temperature Dependence ◽  
Pressure Dependence ◽  
Type I ◽  
Type Ii ◽  
Deformation Potential ◽  
Intervalley Scattering

ABSTRACTWe have studied the pressure dependence of the type-I and type-II transitions in (GaAs)m/(AlAs)m superlattices by photoluminescence (PL) spectroscopy. From the study of PL linewidths of the type-I exciton as a function of pressure and temperature, we determine the intervalley deformation potential. Beyond the type-I and type-II crossover, the PL linewidth increases both as a function of pressure and temperature. We find that the electron-phonon deformation potential for Γ-X intervalley scattering varies with temperature.

Temperature Dependence of N2-Relaxation of Rotational Lines of Propionitrile

1992 ◽  
Vol 47 (9) ◽  
pp. 999-1002 ◽  
Author(s):  
H.-W. Nicolaisen ◽  
H. Mäder ◽  
F. Rohart
Keyword(s):  
Temperature Dependence ◽  
Pressure Dependence ◽  
Decay Rates ◽  
Rotational Relaxation ◽  
Pressure Broadening ◽  
Ambient Temperatures

AbstractThe temperature dependence of the rotational relaxation of propionitrile, CH3CH2C15N, has been investigated by means of microwave transient emission signals. From analysis of the pressure dependence of the coherence decay rates for the rotational lines (J, K-, K+) = (2, 0, 2)-(3, 0, 3), (2,1, 2)-(3, 1, 3), and (2, 2, l)-(3, 2, 2) pressure broadening parameters have been derived for mixtures with nitrogen in the 210-300 K range and for the pure gas at ambient temperatures

Interaction between argon atoms

1960 ◽  
Vol 255 (1283) ◽  
pp. 456-476 ◽  
Keyword(s):  
Temperature Dependence ◽  
Interaction Energy ◽  
High Temperatures ◽  
Pressure Dependence ◽  
Virial Coefficient ◽  
Second Virial Coefficient

The interaction energy between argon atoms is correlated with the following experimental properties of argon: (1) the temperature dependence of the entropy of the crystal, (2) the temperature dependence of the energy of the crystal, (3) the temperature dependence of the density of the crystal, (4) the pressure dependence of the density of the crystal, (5) the temperature dependence of the second virial coefficient of the gas, (6) the viscosity at high temperatures of the gas. The interaction energy which best accords with all these properties is strikingly different from the commonly advocated difference between an inverse twelfth power and an inverse sixth power of the distance.

Pressure- and Temperature-Dependence of the Electrical Resistivity of Some Nonmagnetic d-electron Amorphous Alloys

1982 ◽  
Vol 37 (11) ◽  
pp. 1235-1240
Author(s):  
G. Fritsch ◽  
J. Wilier ◽  
E. Lüscher
Keyword(s):  
Electrical Resistivity ◽  
Temperature Dependence ◽  
Pressure Dependence ◽  
Amorphous Alloys ◽  
Electron Gas ◽  
Temperature Dependent ◽  
Absolute Value ◽  
Volume Dependence ◽  
Dependent Term ◽  
Scattering Potential

Using the Ziman-formulation a model is derived which describes the pressure dependence of the electrical resistivity of d-electron amorphous alloys. It is shown how the volume dependence of the scattering-potential, electron-gas-properties and the Grüneisenparameter determine the P-dependence of a constant and a temperature dependent term in the resistivity. The absolute value of the resistivity is discussed.

scholarly journals Anomalous Temperature Dependence of NQR Frequencies

1990 ◽  
Vol 45 (3-4) ◽  
pp. 449-458
Author(s):  
R. J. C. Brown
Keyword(s):  
Heat Capacity ◽  
Temperature Dependence ◽  
Elastic Constants ◽  
Pressure Dependence ◽  
Anomalous Temperature Dependence ◽  
Anomalous Temperature ◽  
Reorientational Motion ◽  
Successes And Failures

Abstract The anomalous temperature dependence of NQR frequencies which is often observed in crystals in which there is reorientational motion of ions or molecules is considered. Two theories of the phenomena, the jump rotation theory and the pseudo-spin theory, are described, and their successes and failures are discussed. The importance of considering other properties such as pressure dependence of NQR, heat capacity, and elastic constants is emphasized, and it is shown that neither theory is entirely satisfactory at present.

Temperature dependence of the vibrational properties of sodium microclusters

2001 ◽  
Vol 684 (1-4) ◽  
pp. 655-657
Author(s):  
F.-S. Zhang ◽  
F. Wang ◽  
E. Suraud ◽  
F. Spiegelmann
Keyword(s):  
Temperature Dependence ◽  
Vibrational Properties

CALCULATION OF VOLUME AS FUNCTIONS OF TEMPERATURE AND PRESSURE IN ICE I CLOSE TO THE MELTING POINT

2010 ◽  
Vol 24 (19) ◽  
pp. 3749-3758
Author(s):  
E. KILIT ◽  
H. YURTSEVEN
Keyword(s):  
Experimental Data ◽  
Melting Point ◽  
Temperature Dependence ◽  
Pressure Dependence ◽  
Critical Behavior ◽  
Isothermal Compressibility ◽  
Thermal Expansivity ◽  
Experimental Measurements ◽  
Approximate Relation ◽  
Temperature And Pressure

We calculate in this study the volume of ice I as functions of temperature and pressure close to the melting point by analyzing the experimental data for the thermal expansivity. Using an approximate relation, the temperature dependence of the volume is calculated at 202.4 MPa from the thermal expansivity of ice I. The pressure dependence of the volume is also calculated at 252.3 K from the isothermal compressibility of ice I close to the melting point. The volume calculated here as functions of temperature and pressure shows critical behavior close to the melting point in ice I, which can be tested by the experimental measurements.

The low energy phonon modes of the hydrogenated and deuterated π-conjugated system 7,7,8,8-tetracyanoquinodimethane: an inelastic neutron scattering study

2021 ◽  
Vol 23 (4) ◽  
pp. 2899-2905
Author(s):  
Adam Berlie ◽  
Hamish Cavaye
Keyword(s):  
Temperature Dependence ◽  
Inelastic Neutron Scattering ◽  
Parent Compound ◽  
Inelastic Neutron ◽  
Low Energy ◽  
Vibrational Properties ◽  
Phonon Modes ◽  
Scattering Study ◽  
Neutron Scattering Study ◽  
Lattice Modes

TCNQ is a fascinating molecule with potential for optical, electronic and magnetic materials. Our work studies the low energy lattice modes of the parent compound to further understand the vibrational properties including their temperature dependence.

Correlation Between the Anomalous Pressure Dependence of the Superconducting Transition Temperature in Thallium and the Temperature Dependence of its Knight Shift

1974 ◽  
Vol 52 (8) ◽  
pp. 678-686 ◽  
Author(s):  
J. Schratter ◽  
D. Llewelyn Williams
Keyword(s):  
Transition Temperature ◽  
Temperature Dependence ◽  
Pressure Dependence ◽  
Superconducting Transition Temperature ◽  
Knight Shift ◽  
Superconducting Transition ◽  
Electronic Density ◽  
Nonlinear Variation ◽  
Volume Dependence ◽  
Increasing Temperature

A study of the Knight shift has been carried out on a single crystal of thallium. The isotropic Knight shift decreases with increasing temperature, showing a nonlinear variation which is most pronounced between 50 and 150 K. This behavior is correlated with the anomalous pressure dependence of the superconducting transition temperature at low pressure. From the superconducting data on pure Tl and Tl–Hg alloys, we extract the volume dependence of the electronic density of states, and use it to derive the temperature dependence of the Knight shift. The results agree with the observed data.

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