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TEMPERATURE DEPENDENCE OF THE RAMAN FREQUENCIES IN THE gamma AND beta PHASES OF SOLID NITROGEN
Date
2010-12-20
Author
Yurtseven, Hasan Hamit
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We study here the Raman frequencies of the lattice modes (gamma and beta phases) and of an internal mode (gamma phase) as a function of temperature in solid nitrogen. The frequency shift, derived from the anharmonic self energy, is fitted to the experimental data for the Raman frequencies of the modes considered here in the gamma and beta phases of solid nitrogen.
Subject Keywords
Statistical and Nonlinear Physics
,
Condensed Matter Physics
URI
https://hdl.handle.net/11511/49248
Journal
INTERNATIONAL JOURNAL OF MODERN PHYSICS B
DOI
https://doi.org/10.1142/s0217979210057614
Collections
Department of Physics, Article
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Using mean-field theory with p(2)theta(2) coupling term in the free energy expansion, we calculate the polarization as a function of concentration for the AC* phase transition in a binary mixture of C7 and 10.O.4 liquid crystalline material. Our calculated values of polarization are in good agreement with the experimental data.
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Yurtseven, Hasan Hamit (World Scientific Pub Co Pte Lt, 2011-05-20)
We study here the tilt angle and the temperature shifts as a function of concentration for the AC* phase transition in a binary mixture, using our mean field model with the biquadratic P-2 theta(2) coupling - and also with the bilinear P theta and P-2 theta(2) couplings. By expanding the free energy in terms of the tilt angle and polarization, the tilt angle and the temperature shift, are evaluated by using the coefficients given in the free energy expansion. By employing a concentration-dependent coefficie...
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The damping constant is calculated here at various temperatures for the Raman mode II in s-triazine using the soft mode-hard mode coupling model. The temperature dependence of the order parameter is used as the input data to calculate the damping constant of the Raman mode studied in this coupling model for s-triazine close to the I-II transition (T-c = 198 K). The soft mode-hard mode coupling model which considers the coupling of the soft acoustic mode with the optic modes in s-triazine, is fitted to the o...
CALCULATION OF THE RAMAN FREQUENCIES AT LOW PRESSURES AND TEMPERATURES (sigma-PHASE) SOLID NITROGEN
Yurtseven, Hasan Hamit (World Scientific Pub Co Pte Lt, 2013-09-20)
We calculate the Raman frequencies of the E-g mode and, the low and high frequency T-g mode as a function of temperature at a constant pressure of 2.85 kbar in the alpha-phase of solid nitrogen. The Raman frequencies of those lattice modes are calculated using the volume data from the literature at various temperatures (2.85 kbar) for the alpha-phase of solid N-2 through the mode Gruneisen parameter. Our predicted Raman frequencies can be compared with the experimental data and by this method the Raman freq...
RAMAN STUDY OF BENZENE NEAR THE MELTING POINT
Yurtseven, Hasan Hamit (World Scientific Pub Co Pte Lt, 2013-06-10)
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H. H. Yurtseven, “TEMPERATURE DEPENDENCE OF THE RAMAN FREQUENCIES IN THE gamma AND beta PHASES OF SOLID NITROGEN,”
INTERNATIONAL JOURNAL OF MODERN PHYSICS B
, pp. 6069–6078, 2010, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/49248.