FIELD: chemistry.
SUBSTANCE: method of determining system of physical and chemical properties of n-alkanes by spectroscopy involves direct measurement of the ionisation energy by photoelectron spectroscopy and then calculating values of corresponding physical and chemical properties from the ionisation energy based on empirical relationships of the type 
where αi and βi are corresponding empirical coefficients; Z is the molecular weight, or boiling point, or relative density, or refraction index, or critical temperature, or heat of vaporisation; PI denotes ionisation energy values determined by photoelectron spectroscopy, eV.
EFFECT: simple procedure of determining the system of physical and chemical properties.
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