Double differential distribution of electron emission in the ionization of water molecules by fast bare oxygen ions

S. BHATTACHARJEE; S. BISWAS; C. BAGDIA; M. ROYCHOWDHURY; S. NANDI; D. MISRA; J. M. MONTI; C. A. TACHINO; R. D. RIVAROLA; C. CHAMPION; L. C. TRIBEDI

JOURNAL OF PHYSICS B-ATOMIC MOLECULAR AND OPTICAL PHYSICS

IOP PUBLISHING LTD

Lugar: Londres; Año: 2016 vol. 49 p. 652021 - 652029

0953-4075

The doubly differential distributions of low-energy electron emission in the ionization of watermolecules under the impact of fast bare oxygen ions with energy of 48 MeV are measured. Themeasured data are compared with two quantum-mechanical models, i.e. the post and priorversions of the continuum distorted wave?eikonal initial state (CDW-EIS) approximation, andthe first-order Born approximation with initial and final wavefunctions verifying correctboundary conditions (CB1). An overall excellent qualitative agreement is found between the dataand the CDW-EIS models whereas the CB1 model showed substantial deviation. However, thedetailed angular distributions display some discrepancies with both CDW-EIS models. Thesingle differential and total cross-sections exhibit good agreement with the CDW-EIS models.The present detailed data set could also be used as an input for modeling highly charged ioninduced radiation damage in living tissues, whose most abundant component is water. Similarmeasurements are also carried out for a projectile energy of 60 MeV. However, since the doubledifferential cross-section data show similar results the details are not provided here, except forthe total ionization cross-sections results.