The ionization potentials and total ionization cross sections of glucose and ribose monosaccharide molecules were measured by electron impact at energies up to 70 eV. Using two methods, Hartree–Fock (HF) and density functional theory (DFT), the structure of d- and l-forms of glucose and ribose molecules were calculated using Gaussian. The energy characteristics of the molecular orbitals (MOs) were used to calculate the summarized single ionization cross sections (CS) based on the MOs by the Binary–Encounter–Bethe (BEB) and Gryzinsky (Gryz) models.

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