Dynamic of negative ions in potassium-D-ribose collisions

D. Almeida, F. Ferreira da Silva, G. Garcia, P. Limão-Vieira

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10 Citations (Scopus)
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Abstract

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.
Original languageEnglish
Article number114304
JournalJournal of Chemical Physics
Volume139
Issue number11
DOIs
Publication statusPublished - 21 Sep 2013

Keywords

  • ATOM-MOLECULE COLLISIONS
  • LOW-ENERGY-ELECTRON
  • GAS-PHASE
  • INTERACTION-MODEL
  • DNA-DAMAGE
  • NITROMETHANE
  • ATTACHMENT
  • URACIL
  • 5-CHLOROURACIL
  • FRAGMENTATION

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