Heidelberg 2015 – wissenschaftliches Programm

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A: Fachverband Atomphysik

A 26: Poster: Collisions, scattering and recombination

A 26.8: Poster

Mittwoch, 25. März 2015, 17:00–19:00, C/Foyer

Ionization cross sections of DNA constituents by light ions — •Mingjie Wang, Daniel Bennett, Ticia Buhr, Benedikt Rudek, Gerhard Hilgers, and Hans Rabus — Physikalisch-Technische Bundesanstalt, Bundesallee 100, 38116 Braunschweig, Germany

Within the framework of the EMRP Joint Research Project "BioQuaRT" [1], a multiscale track structure simulation program based on interaction cross sections of DNA constituents is being developed. To this end, ionization cross sections for model molecules representing DNA constituents are being determined.

In the present work, double differential cross sections for the ionization of tetrahydrofuran (THF) by protons and helium ions with energies in the respective Bragg peak regions were measured. The experiments were carried out using the accelerator facilities at the PTB at energies from 70 keV to 3.3 MeV. The electrons emitted at angles between 30° and 90° relative to the ion beam direction were detected with an electrostatic hemispherical electron spectrometer. The measured spectra are converted into absolute cross sections using the transmission and detection efficiency of the analyzer. The latter are determined from measured spectra for the collision of 100 eV electrons with THF using electron cross section data for elastic scattering and ionization of THF reported by Baek et al. [2].

[1] Project web site: http://www.ptb.de/emrp/bioquart.html. The EMRP is jointly funded by the EMRP participating countries within EURAMET and the European Union.

[2] W. Y. Baek et al., Phys. Rev. A 86, 032702 (2012)

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