The gas chromatography-mass spectrometry and dielectric spectroscopy techniques are used to characterize the thermodynamic properties of the essential oils extracted from two main Mediterranean wildland fuels, namely eucalyptus leaves and Pinus halepensis needles. These oils are assumed to be representative of the fuels organic volatile components that exhibit different fire behaviors. The relaxation frequencies determined from the peak of the imaginary permittivity spectra using the Havriliak–Negami empirical law revealed the Arrhenius dependence on temperature. Two activation energies are obtained: the first is around 4.13 kJ/mol for both species, and the second activation energy is around 1.27 kJ/mol for the Pinus halepensis essential oil and around 2.15 kJ/mol for the eucalyptus essential oil. Qualitative and quantitative composition differences are observed with GC–MS measurements for eucalyptus leaves and Pinus halepensis needles essential oils.

气相色谱-质谱和介电光谱技术用于表征从两种主要的地中海荒地燃料中提取的精油的热力学特性，即桉树叶和松针。这些油被假定为具有不同燃烧特性的燃料有机挥发性成分的代表。使用 Havriliak-Negami 经验定律从虚介电常数谱的峰值确定的弛豫频率揭示了 Arrhenius 对温度的依赖性。获得了两个活化能：两个物种的第一个活化能约为 4.13 kJ/mol，黑松精油的第二个活化能约为 1.27 kJ/mol，桉树精油约为 2.15 kJ/mol。