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1

Pressure Dependence of the Raman Frequencies of Ammonia Solid I near the Melting Point

100%

Yurtseven H.

Acta Physica Polonica A

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2001

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vol. 99

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issue 5

557-564

EN

We calculated in this study the Raman frequencies of some lattice modes in the melting region of ammonia solid I. The Raman frequencies of those phonon modes were obtained through the Grüneisen relation using the volume data for the ammonia solid I from the literature. Our calculated Raman frequencies require for comparison the experimental Raman frequencies measured as a function of pressure for some fixed temperatures in the ammonia solid I.

2

Pressure Dependence of the Raman Modes Related to the Phase Transitions in Cyclohexane

63%

Yurtseven H., Cebeci A.

Acta Physica Polonica A

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2015

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vol. 127

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issue 3

744-747

EN

The pressure dependence of the Raman frequencies for the ν_{21} mode is studied by using the volume data at room temperature close to the transitions among the phases of III, IV and V in cyclohexane. By determining the pressure dependence of the mode Grüneisen parameter γ_{T} in the phases and taking the average values, the Raman frequencies of those modes associated with the phase transitions are predicted through the volume data in cyclohexane. Our predicted Raman frequencies agree with those observed experimentally in this organic molecule. The Raman frequencies of the other modes can be calculated in cyclohexane and also in some molecular crystals using the method given here.

3

Temperature and Pressure Dependence of the Linewidth for an Internal Mode in the Solid Phases of Benzene

63%

Yurtseven H., Şenol M.

Acta Physica Polonica A

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2013

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vol. 124

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issue 4

698-701

EN

The pressure dependence of the Raman linewidths for the ν_1 breathing mode is analyzed using the experimental data from the literature for the solid phases (I, II, III and III') in benzene. Increase (I, III and III') and decrease (II) in the Raman linewidths are described by a power-law analysis with the critical exponent β. The β values we find, which characterize the phase transition are in favour of the first order among those phases considered in benzene. The temperature and pressure dependence of the frequencies and linewidths of various Raman modes can be analyzed using a power-law formula, as studied here for the solid phases (I, II, III and III') in benzene when the experimental data are available in the literature.

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3 Acta Physica Polonica A

1 2015

1 2013

1 2001

3 Yurtseven H.

1 Cebeci A.

1 Şenol M.

Pressure Dependence of the Raman Frequencies of Ammonia Solid I near the Melting Point

Pressure Dependence of the Raman Modes Related to the Phase Transitions in Cyclohexane

Temperature and Pressure Dependence of the Linewidth for an Internal Mode in the Solid Phases of Benzene