Biopolym. Cell. 2005; 21(6):531-535.
Molecular Biophysics
Negative ions formation of the cytosine molecule by electron impact
1Sukhoviya M. I., 1Shafranyosh M. I., 1Margitich M. O., 1Shafranyosh I. I.
  1. Uzhhorod National University
    54, Voloshyna Str., Uzhhorod, Ukraine, 88000

Abstract

The absolute cross sections for negative ions formations of the nucleic acid base – cytosine were found first using the modern technic of normally crossed molecular and electron beams. The ionization cross section had maximum at 1.45 eV of the electron energy and was 4.2×10–18 cm2. Biophysical consequences of the obtained results are discussing.
Keywords: cytosine, negative ions, effective cross section, electron impact, damage of the cells by slow electrons

References

[1] Sukhoviya MI, Shafranyosh II. Excitation of nitrogenous bases of nucleic acids of low-energy electrons. Mechanisms of radiation damage and recovery of nucleic acids. Puschino-na-Oke, 1980;51.
[2] Sukhovija MI, Slavik VN, Shafranyosh II, Shimon LL. Interaction of nucleic acid bases molecules with low-energy electrons. Biopolym Cell. 1991; 7(6):77-82.
[3] Sukhoviya MI, Shafranyosh MI, Shafranyosh II. Spectral investigation of the electron-impact excitation of the nucleic acid base molecules Il Spectroscopy of biological molecules: New directions. Dordrecht etc.: Kluwer Acad, publ., 1999; 281-2.
[4] Aflatooni K, Gallup GA, Burrow PD. Electron Attachment Energies of the DNA Bases. J Phys Chem A. 1998;102(31):6205–7.
[5] Hanel G, Gstir B, Denifl S, Scheier P, Probst M, Farizon B, et al. Electron Attachment to Uracil: Effective Destruction at Subexcitation Energies. Physical Review Letters . American Physical Society (APS); 2003;90(18): 188104. .
[6] Shafranyosh II, Margitich MO. Electron-impact ionization cross section for metastable Ca (3p 6 4s4p 3 P 0,2 ) atoms . Journal of Physics B: Atomic, Molecular and Optical Physics. 2000;33(5):905–10.
[7] Denifl S, Hanel G, Gstir B, Probst M, Ptasinska S, Hlenberger E. Site selective electron attachment to RNA and DNA bases. Abstr. XXIII Int. Conf. on Photonic, Electronic and Atomic Collision (ICPEAC). Stockholm, 2003; We096.
[8] Massey HSW. Negative Ions Cambridge University Press, 1976; 759 p.
[9] Gurvich LV, Karachevtsev GV, Kondrat'yev VN. et al. Bond-dissociation energy. The ionization potentials and electron affinities. M.: Nauka, 1974. 351 p.
[10] Morozov YuV, Bazhulina NP. Electronic structure, spect­roscopy and reactivity of the molecules. Moscow: Mir, 1989. 288 p.
[11] Govorun DM, Kondratyuk IV, Mishchuk YaR, Zheltovskyi MV. The nonequavalence of amine hydrogens in canonical nucleotide bases. Dopovidi Nats Akad Nauk Ukrainy. 1995; (8):130-2.