Almeida, D.Ferreira da Silva, F.Garcia, G.Limão-Vieira, P.2018-07-172018-07-172013-09-210021-9606PURE: 452070PURE UUID: da561fe0-8d49-4da7-9b23-14040e3d7614researchoutputwizard: 41405WOS: 000324827800018Scopus: 84884852073Bibtex: urn:9acbc8a4059924a21437f1be78538c75PubMed: 24070287ORCID: /0000-0002-2182-2965/work/46764317ORCID: /0000-0003-2696-1152/work/151411915http://hdl.handle.net/10362/41820P.L.-V. acknowledges his visiting professor position at The Open University, UK. The Spanish Ministerio de Economia y Competitividad (Project No. FIS 2012-31230) is also acknowledged. Some of this work forms part of the EU/ESF COST Actions Nano-IBCT-MP1002 and The Chemical Cosmos-CM0805.We present negative ion formation from collisions of neutral potassium atoms with D-ribose (C5H10O5), the sugar unit in the DNA/RNA molecule. From the negative ion time-of-flight (TOF) mass spectra, OH- is the main fragment detected in the collision range 50-100 eV accounting on average for 50% of the total anion yield. Prominence is also given to the rich fragmentation pattern observed with special attention to O- (16m/z) formation. These results are in sharp contrast to dissociative electron attachment experiments. The TOF mass spectra assignments show that these channels are also observed, albeit with a much lower relative intensity. Branching ratios of the most abundant fragment anions as a function of the collision energy are obtained, allowing to establish a rationale on the collision dynamics. (C) 2013 AIP Publishing LLC.704142engATOM-MOLECULE COLLISIONSLOW-ENERGY-ELECTRONGAS-PHASEINTERACTION-MODELDNA-DAMAGENITROMETHANEATTACHMENTURACIL5-CHLOROURACILFRAGMENTATIONjournal article10.1063/1.4820949