Electron emission from water and neucleobases with radio-sensitizer

Abstract

We report a comprehensive study of the double differential e-emission cross sections from water, adenine, uracil and bromouracil in collisions with fast highly charged C, O and Si ions ~MeV/u i.e. at the Bragg peak. A large enhancement in e-DDCS for bromouracil (a radiosensitizer) over adenine and uracil has been observed which can not be explained by electron statistics, rather in terms of collective shape resonance or Auger cascade in Br. Large set of TCS data provides a scaling law in terms of vp and qp, The agreement with the QM model calculations (CDW-EIS, CB1) for such large molecules is encouraging. We have also measured the K-ionization and K-K e-transfer TCS for adenine.