Advertisement

X-Ray Radiolysis of Condensed Systems: Solid DNA and DNA Solutions

  • Fabio Busi
Part of the NATO Advanced Study Institutes Series book series (NSSA, volume 25)

Abstract

We have seen in the previous lectures that the effect of ionizing electromagnetic radiation on a system is, at the first stage, the production of high energy electrons by photoelectric or Compton effect. The fast moving electrons transfer their energy to the molecules of the system in the vicinity of their trajectory by ionization or excitation processes. These primary products, excited molecules, positive ions and ejected electrons undergo secondary reactions which ultimately lead to stable products. The yields of primary ionization and excitation depend on molecular properties that are at the present largely unknown. The most important of these properties is the excitation spectrum, which we have seen is closely related to the absorption spectrum of the molecule extending from the visible region to the X-ray region. The synchrotron radiation has been used for experiments in this field(1,2). The absorption spectroscopy and the experimental set up for experiment using synchrotron radiation are topics of other lectures so we will simply show, as an example, the result obtained on benzene, in the region up to 35 eV (figure 1)(2). The upper spectrum is a generalized excitation spectrum with the three regions of excitation, super-excitation and ionization, the bottom one is the absorption spectrum of benzene. This spectrum covers the whole interesting region, the one of superexcited state formation.

Keywords

Synchrotron Radiation Primary Ionization Pulse Radiolysis Transient Absorption Spectrum Compton Effect 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Preview

Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

References

  1. 1).
    M.B. Robin, Higher Electronic States of Polyatomic Molecules, Academic Press, New York 1974, Vol. 1, 1975, Vol. 2.Google Scholar
  2. 2).
    E.E. Koch and A. Otto, Int. J. Radiat. Phys. Chem. 8, 113 (1976).CrossRefGoogle Scholar
  3. 3).
    E.M. Fielden, Quaderni de La Ricerca Scientifica, 68, 63 (1970).Google Scholar
  4. 4).
    C. Nicolau, O. Korner and A. Cristea, Studia. Biophys., Berlin, 1, 59 (1966).Google Scholar
  5. 5).
    G.E. Adams, Quaderni de La Ricerca Scientifica, 68, 27 (1970).Google Scholar

Copyright information

© Plenum Press, New York 1979

Authors and Affiliations

  • Fabio Busi
    • 1
  1. 1.Laboratorio di Fotochimica e Radiazioni d’Alta EnergiaC.N.R.BolognaItaly

Personalised recommendations