Frontiers in Nuclear and Particle Physics

Frontiers in Nuclear and Particle Physics

Volume: 1

Multi-electronic Processes in Collisions Involving Charged Particles and Photons with Atoms and Molecules

This volume describes the advanced research on the behavior of electrons in ionized atoms and molecules. Readers will learn about relevant techniques used and experimental results for different ...
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Selective Excision of Biomolecules in Electron Transfer Experiments: Current Developments and Achievements

Pp. 52-74 (23)

Paulo Limao-Vieira, Filipe Ferreira da Silva and Gustavo Garcia

Abstract

Here we revisit electron transfer processes yielding negative ion formation in gas-phase collisions of fast neutral potassium atoms (electron donor) and biomolecular target molecules (electron acceptor) in a crossed molecular-beam arrangement. The negative ions formed in the interaction region are time-of-flight (TOF) mass analysed as a function of the collision energy. Selective site and bond excision in the unimolecular decomposition of the transient negative show clear dependence on the collision energy.

Keywords:

Anions, Attachment, Atom-molecule collisions, DNA/RNA subunits, DNA-strand breaks, Electron transfer, Electrons, Fragmentation, Gas-phase, Metastable decay, TOF mass spectrometry, Radiation damage.

Affiliation:

Laboratório de Colisoes Atomicas e Moleculares, CEFITEC, Departamento de Física, Faculdade de Ciencias e Tecnologia, Universidade NOVA de Lisboa, 2829-516 Caparica, Portugal.