scholarly journals THERMODYNAMIC BEHAVIOUR OF HYPERSENSITIVE TRANSITION OBSERVED IN SOME THULIUM ION DOPED SYSTEMS

2013 ◽  
Vol 22 ◽  
pp. 660-663
Author(s):  
MAHENDRA VYAS ◽  
PRAVEEN PUROHIT ◽  
GARIMA PRAJAPAT ◽  
H. K. PANDEY
Keyword(s):  
Partition Function ◽  
Thermodynamic Parameters ◽  
Spectroscopic Data ◽  
Thermodynamic Efficiency ◽  
Hypersensitive Transition ◽  
Thermodynamic Behaviour

The Tm(III) doped systems with various ligands studied with respect to hypersensitive transition. The spectroscopic data for hypersensitive transition have been correlated with the thermodynamic parameters. The thermodynamic parameters include thermodynamic efficiency and partition function of the transition.

scholarly journals Thermodynamical Quantities of Chalcogenide Dimers (O2, S2, Se2, and Te2) from Spectroscopic Data

2013 ◽  
Vol 2013 ◽  
pp. 1-6 ◽  
Author(s):  
Shipra Tiwari ◽  
Pavitra Tandon ◽  
K. N. Uttam
Keyword(s):  
Partition Function ◽  
Spectroscopic Data ◽  
Function Theory ◽  
Diatomic Molecules ◽  
Molecular Motions ◽  
Temperature Range

Attempts have been made to calculate the thermodynamical quantities of diatomic molecules such as O2, S2, Se2, and Te2from spectroscopic data with the help of partition function theory. The results have been calculated in the temperature range 100–3000°C. In order to increase accuracy of the calculated quantities, we have incorporated nonrigidity, anharmonicity, and stretching effects of molecules. The variation of these quantities with temperature have been studied and explained in terms of various modes of molecular motions.

Partition Function Ratios of the Methyl Halides Differing Only in Isotopic Substitution

1974 ◽  
Vol 52 (17) ◽  
pp. 3078-3082 ◽  
Author(s):  
Jan Bron
Keyword(s):  
Partition Function ◽  
Spectroscopic Data ◽  
Force Fields ◽  
Isotopic Substitution ◽  
Methyl Halides

By using the best available spectroscopic data for the force fields and geometries of the methyl halides, partition function ratios for these species are evaluated as a function of temperature. These ratios are of the type q(AXYZB)/q(12CH3B) in which q is the partition function; A is 12C, 13C, or 14C; X, Y, and Z are either 1H, 2H, or 3H; and B stands for either F, Cl, Br, or I. To the logarithm of these functions at the various temperatures (200–500 K) a curve is fitted with the equation [Formula: see text] All ratios are determined with respect to the unsubstituted 12CH3B molecule. Examples of the utility of the partition function ratios are given.

Large Amplitude Thermal Fluctuations of Confined Semiflexible Biopolymer Filaments

2014 ◽  
Vol 81 (11) ◽  
Author(s):  
F. Jonsdottir ◽  
L. B. Freund
Keyword(s):  
Free Energy ◽  
Partition Function ◽  
Thermodynamic Parameters ◽  
Large Amplitude ◽  
Small Amplitude ◽  
Thermal Fluctuations ◽  
Single Filament ◽  
Amplitude Fluctuations ◽  
Active Interest

The phenomenon of thermal fluctuations of biopolymers has been of active interest for some time with a view toward understanding the effect of filament confinement, migration, and bonding. In this study, we focus our attention on planar fluctuations of a single filament between parallel confining surfaces. Filament slopes, with respect to the centerline of the channel, commonly exceed 0.1 in magnitude and therefore fall outside the range of small amplitude fluctuations. Consequently, large amplitudes are anticipated from the outset. Determination of the partition function leads to the quantitative dependence of free energy and other thermodynamic parameters on the degree of confinement.

scholarly journals Complexation Thermodynamics of Selenacrown Ether: Origin of High Silver(I) Selectivity of 1,5,14,18-Tetraselena-8,11,21,24-tetraoxacyclohexacosane

1999 ◽  
Vol 23 (4) ◽  
pp. 284-285
Author(s):  
Yu Liu ◽  
Shu-Ping Dong ◽  
Yoshihisa Inoue ◽  
Takehiko Wada
Keyword(s):  
Heavy Metal ◽  
Thermodynamic Parameters ◽  
Titration Calorimetry ◽  
Covalent Interaction ◽  
Heavy Metal Cations ◽  
Cation Selectivity ◽  
Thermodynamic Behaviour ◽  
First Time ◽  
High Silver ◽  
Very High

The thermodynamic parameters and relative cation selectivity for complexation of some alkali and heavy metal cations with 1,5,14,18-tetraselena-8,11,21,24-tetraoxacyclohexacosane (selena-26-crown-8) are investigated for the first time by titration calorimetry in water–acetonitrile (1:24 v/v) at 25 °C to show the contrasting complexation thermodynamic behaviour between Ag+ and alkali or Tl+ and a very high Ag+ selectivity, originating from the exclusive contribution of the enthalpy term probably owing to the partially covalent interaction between Ag+ and Se donor.

Models of Thermodynamic Properties of Prominences

1979 ◽  
Vol 44 ◽  
pp. 349-355
Author(s):  
R.W. Milkey
Keyword(s):  
Thermodynamic Properties ◽  
Mass Transport ◽  
Emission Spectrum ◽  
Thermodynamic Parameters ◽  
Working Group ◽  
Physical Processes ◽  
Theoretical Concepts ◽  
Group 3 ◽  
Observational Techniques

The focus of discussion in Working Group 3 was on the Thermodynamic Properties as determined spectroscopically, including the observational techniques and the theoretical modeling of physical processes responsible for the emission spectrum. Recent advances in observational techniques and theoretical concepts make this discussion particularly timely. It is wise to remember that the determination of thermodynamic parameters is not an end in itself and that these are interesting chiefly for what they can tell us about the energetics and mass transport in prominences.

Models of Cataclysmic Variables from Photometric and Spectroscopic Data

1979 ◽  
Vol 46 ◽  
pp. 65-74 ◽  
Author(s):  
A.C. Fabian ◽  
J.E. Pringle ◽  
J.A.J. Whelan ◽  
J.A. Bailey
Keyword(s):  
Spectroscopic Data ◽  
Cataclysmic Variables ◽  
System Parameters ◽  
Dwarf Nova ◽  
Spectroscopic Observations ◽  
Photometric And Spectroscopic Observations

Abstract.Recent photometric and spectroscopic observations of the dwarf nova system Z Cha are discussed. Methods for constraining the system parameters are applied and the disc emissivity is deduced as a function of radius. Indications are found that the disc shrinks in size with increasing time after outburst.

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