Ion-pair formation to gas phase molecules induced by electron transfer has been studied by investigating the products of collisions between fast potassium atoms and target molecules using a crossed molecular-beam technique. The negative ions formed in such collisions are TOF mass analysed. As far as (bio)molecules are concerned, TOF mass spectra at different collision energies reveal interesting anionic patterns with reduced fragmentation at lower impact energies. In the unimolecular decomposition of the temporary negative ion (TNI), complex internal rearrangement may involve the cleavage and formation of new bonds. In this chapter we report some of the recent achievements in negative ion formation of some polyatomic molecules with the special attention to biological relevant targets.
|Title of host publication||Radiation Damage to Biomolecular Systems|
|Editors||G. Garcia, M.C. Fuss|
|Place of Publication||Germany|
|ISBN (Print)||DOI 10.1007/978-94-007-2564-5 3|
|Publication status||Published - 1 Jan 2011|
|Name||Biological and Medical Physics, Biomedical Engineering|