On temperature-dependent frequency factor in thermoluminescence measured with a hyperbolic heating profile

2001 ◽  
Vol 79 (9) ◽  
pp. 1133-1139 ◽  
Author(s):  
W S Singh ◽  
M Bhattacharya ◽  
S D Singh ◽  
P S Mazumdar
Keyword(s):  
Activation Energy ◽  
Temperature Dependence ◽  
Frequency Factor ◽  
Temperature Dependent ◽  
Order Of Kinetics ◽  
Dependent Frequency ◽  
Symmetry Factor ◽  
Heating Profile

In this paper, we investigate the consequences of the temperature dependence of the frequency factor on thermoluminescence peaks recorded in a hyperbolic heating profile. The temperature dependence of the frequency factor leads to nonuniqueness in the symmetry factor for a particular order of kinetics (b) and causes an error of the order of 5% in the determination of b and an error of the order of 10% in the determination of activation energy (E). PACS No.: 78.60Kn

An Overview on Peak Shape Method for Thermoluminescence Glow Curve Analysis

2018 ◽  
pp. 26-52
Author(s):  
Sukhamoy Bhattacharyya ◽  
Partha Sarathi Majumdar
Keyword(s):  
Activation Energy ◽  
Glow Curve ◽  
Frequency Factor ◽  
Curve Analysis ◽  
Peak Shape ◽  
Order Of Kinetics ◽  
Symmetry Factor ◽  
Alternative Approach ◽  
General Order ◽  
Thermoluminescence Glow Curve

The shape of a thermoluminescence (TL) glow curve has fundamental importance for calculating the characteristic parameters of trap levels within the band gap. TL analysis are mostly based on the three-parameter general order kinetics model. The parameters are activation energy, order of kinetics, and frequency factor. Peak shape method is one of the most prominent methods for extracting the activation energy from a TL curve. An overview of different peak shape methods along with an alternative approach formulated directly from basic TL equations is presented in this chapter. Generally, peak shape method requires prior knowledge of order of kinetics to determine activation energy which creates a difficulty due to the non-uniqueness of symmetry factor for a particular value of order of kinetics. A modified version of peak shape method which is free from this constraint is discussed here. Activation energies from experimental curves of tremolite and actinolite are estimated using peak shape method. Limitation of peak shape method for saturated TL peaks with heavy retrapping is also discussed.

Determination of the temperature exponent for the case of the temperature-dependent frequency factor in thermoluminescence

2000 ◽  
Vol 78 (4) ◽  
pp. 253-260 ◽  
Author(s):  
Manabesh Bhattacharya ◽  
W Shambhunath Singh ◽  
P S Mazumdar
Keyword(s):  
Frequency Factor ◽  
Temperature Dependent ◽  
Dependent Frequency

We suggest a method for the determination of the temperature exponent in the case of the temperature-dependent frequency factor in thermoluminescence (TL).The applicability of the method has been tested by applying it both to numerically computed and experimental TL peaks.PACS No.: 78.60Kn

scholarly journals Temperature-Dependent Broadening of the Ultraviolet Photoelectron Spectrum of Au(110)

Sensors ◽  
2021 ◽  
Vol 21 (17) ◽  
pp. 5969
Author(s):  
Tomonari Nishida ◽  
Ikuo Kinoshita ◽  
Juntaro Ishii
Keyword(s):  
Fourier Transform ◽  
Temperature Dependence ◽  
Photoelectron Spectroscopy ◽  
Photoelectron Spectrum ◽  
Thermodynamic Temperature ◽  
Temperature Dependent ◽  
Photoelectron Emission ◽  
The Fourier Transform ◽  
The Relationship

To determine the thermodynamic temperature of a solid surface from the electron energy distribution measured by photoelectron spectroscopy, it is necessary to accurately evaluate the energy broadening of the photoelectron spectrum and investigate its temperature dependence. Broadening functions in the photoelectron spectrum of Au(110)’s surface near the Fermi level were estimated successfully using the relationship between the Fourier transform and the convolution integral. The Fourier transform could simultaneously reduce the noise of the spectrum when the broadening function was derived. The derived function was in the form of a Gaussian, whose width depended on the thermodynamic temperature of the sample and became broader at higher temperatures. The results contribute to improve accuracy of the determination of thermodynamic temperature from the photoelectron spectrum and provide useful information on the temperature dependence of electron scattering in photoelectron emission processes.

scholarly journals The Optimum Reaction Time, Activation Energy and Frequency Factor of Methyl Ricinoleate Nitration

2013 ◽  
Vol 13 (1) ◽  
pp. 36-40 ◽  
Author(s):  
Abdullah Abdullah ◽  
Triyono Triyono ◽  
Wega Trisunaryanti ◽  
Winarto Haryadi
Keyword(s):  
Activation Energy ◽  
Reaction Time ◽  
Methyl Ricinoleate ◽  
Frequency Factor ◽  
Optimum Reaction

Determination of the optimum reaction time, activation energy (Ea) and frequency factor (A) of methyl ricinoleate nitration has been done. The nitration was conducted with the mole ratio of methyl ricinoleate to HNO3 of 1:15. The reaction was conducted at temperatures of 29 and 64 °C with a variation of reaction time for 10, 20, 30, 60, 90, 120, and 150 min. Determination of activation energy and frequency factor was performed in a temperature of 29, 33, 38, 44, 49, 57 and 64 °C. The results showed that the optimum reaction time is 90 min. The activation energy (Ea) and frequency factor (A) was 44.5 kJ/mol and 4.780 x 103 sec-1, respectively.

scholarly journals On the influence of temperature and chemical properties on viscosity of Moravian wines

2007 ◽  
Vol 55 (1) ◽  
pp. 59-64 ◽  
Author(s):  
Miroslav Havlíček ◽  
Libor Severa ◽  
Ivo Křivánek
Keyword(s):  
Activation Energy ◽  
Temperature Dependence ◽  
Viscous Flow ◽  
Chemical Properties ◽  
Theoretical Models ◽  
Temperature Influence ◽  
Increasing Temperature ◽  
South Moravia ◽  
And Chemical Properties

Standard chemical analysis was performed to characterise six samples of bottled wines from South Moravia. Temperature influence (range from 20 °C to 50 °C). Density data processing led to determination of the expansibility coefficients at 25 °C and their temperature dependence. It was found that, viscosity of wine decreases non-linearly with increasing temperature. Fitting of the experimental data in some theoretical models was performed in order to describe the temperature dependence of the viscosity of wine. A modified Andrade equation was found to best describe this dependence. The activation energy for viscous flow of wine, calculated by Arhenius relation, varied from 18.50 kJ.mol–1 to 20.15 kJ. mol–1. Correlations between the activation energy for viscous flow and the concentrations of solutes other than ethanol were estimated.

scholarly journals The activation energy of viscoelastic deformation of rocks

2003 ◽  
pp. 101-105
Author(s):  
Dzhema Melkonyan
Keyword(s):  
Activation Energy ◽  
Relaxation Time ◽  
Temperature Dependence ◽  
Probabilistic Approach ◽  
Deformation Energy ◽  
Total Probability ◽  
Suggested Model ◽  
Viscoelastic Deformation ◽  
Viscous Deformation

The suggested model, which considers the simultaneous appearance (on the intermolecular scale) of elastic and viscous behaviors of rocks during their viscoelastic deformation, enables the relaxation time, t0, of the viscoelastic deformation energy to be defined. By determination of t0, the activation energies of the elastic and viscous deformation can be separated from the temperature dependence of the viscoelastic deformation energy stream U. The probabilistic approach to viscoelastic deformation of rocks allows the introduction of the a notion of the total probability, consisting of the probabilities of elastic and viscous deformations.

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