Abstract

The Raman spectroscopy of <i>n</i>-pentane was investigated in a Moissanite anvil cell from 0.07 GPa to 4.77 GPa at ambient temperature. The result shows that the CH₃ symmetric stretching vibration (2877 cm⁻¹) and asymmetric stretching vibration (2964 cm⁻¹), the CH₂ symmetric stretching vibration (2856 cm⁻¹) and asymmetric stretching vibration (2935 cm⁻¹), and –(CH₂)_n– in-phase twist mode (1303 cm⁻¹) shifted to higher wavenumbers almost linearly with increasing pressure. Around 2.4 GPa an abrupt visible change took place, indicating a sort of phenomenon of freezing due to over-pressurization. In the pressure range of 2.84 to 4.77 GPa a high-pressure phase transition may occur in the crystallized <i>n</i>-pentane. By determining pressure with the method of solid–liquid coexistence, we concluded that the equilibrium freezing pressure of <i>n</i>-pentane is 1.90 ± 0.05 GPa at 27 °C.

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