Calculation of the heat capacity Cp from the temperature-induced and pressure-induced Raman frequency shifts for solid benzene, naphthalene and anthracene

Date

2019-02-01

Author

Ozdemir, Hilal
Yurtseven, Hasan Hamit

Metadata

Show full item record

This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Item Usage Stats

229
views

0
downloads

The heat capacity Cp is calculated from the temperature-induced and pressure-induced Raman frequency shifts by means of the mode Griineisen parameter for the I-II transition of solid benzene, naphthalene and anthracene. For this calculation, contributions to Cp are considered due to the six lattice modes of solid benzene, six librational modes of naphthalene and, six phonons and nine vibrons of anthracene with their mode Griineisen parameters at various temperature (P = 0) and pressures (T=300 K). Our calculated Cp explains the observed behavior of the I II transition in solid benzene and also of naphthalene and anthracene. Temperature dependence of the entropy difference is calculated from the heat capacity for those hydrocarbons, which can be compared with the observed data.

Subject Keywords

Electrical and Electronic Engineering, Atomic and Molecular Physics, and Optics, Electronic, Optical and Magnetic Materials

URI

https://hdl.handle.net/11511/56587

Journal

Optik

DOI

https://doi.org/10.1016/j.ijleo.2018.09.070

Collections

Department of Physics, Article

Suggestions

OpenMETU
Core

Calculation of the Raman frequency shifts for the alpha phase of solid oxygen Yurtseven, Hasan Hamit (Elsevier BV, 2017-01-01) We calculate in this study the Raman frequencies of the two librons and one vibron at various pressures at constant temperatures of 10 K and also at the temperatures of 6 and 18 K by using the volume data from the literature through the mode Gruneisen parameter for the a phase of oxygen.
Calculation of the soft-mode frequency for the alpha - beta transition in quartz Yurtseven, Hasan Hamit (Elsevier BV, 2016-01-01) The alpha - beta structural transition occurs in quartz at T-c = 846 K. The frequency of the soft mode associated with the volume increase, decreases with increasing temperature as the transition temperature is approached.
Calculation of the Raman frequency and linewidth of vibrons using anharmonic self energy model for the ε, δloc and δ phases in solid nitrogen Akay, Ö.; Yurtseven, Hasan Hamit (Elsevier BV, 2020-10-01) Temperature dependences of the Raman frequency shifts and linewidths of vibrons ν1, ν2 and ν22 are calculated from the anharmonic self energy in the ε, δloc (localized δ) and δ phases of solid nitrogen (P = 18.5 GPa). This is performed by fitting the expressions from the the anharmonic self energy to the experimental frequency and FWHM data for those vibrons from the literature. Our results show that the anharmonic self energy model can explain adequately the observed behavior of the Raman frequency and lin...
Calculation of the Infrared Frequencies as a Function of Temperature Using the Volume Data in the Ferroelectric Phase of NaNO2 Yurtseven, Hasan Hamit (Informa UK Limited, 2014-02-17) We calculate the temperature dependence of the infrared frequencies of the TO and LO modes with the symmetries of A(1), B-1 and B-2 mainly in the ferroelectric phase of NaNO2. This calculation is carried out using the volume dependence of the infrared frequencies through the mode Gruneisen parameter in this crystal. The volume dependences of the infrared frequencies are fitted to the observed frequencies by using constant mode Gruneisen parameter in the ferroelectric phase of NaNO2. Our results show that th...
Study on the long wavelength SiGe/Si heterojunction internal photoemission infrared photodetectors Aslan, B; Turan, Raşit; Liu, HC (Elsevier BV, 2005-10-01) The theory of internal photoemission in semiconductor heterojunctions has been investigated and the existing model has been extended by incorporating the effect of different effective masses in the active region and the substrate, nonspherical-nonparabolic bands, and the energy loss per collision. Photoresponse measurements on Si1-xGex/Si heterojunction internal photoemission (HIP) infrared photodetectors (IP) have shown that they are fit well by the theory. Qualitative model describing the mechanisms of ph...

Citation Formats

H. Ozdemir and H. H. Yurtseven, “Calculation of the heat capacity Cp from the temperature-induced and pressure-induced Raman frequency shifts for solid benzene, naphthalene and anthracene,” Optik, pp. 774–784, 2019, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/56587.