Dynamic of negative ions in potassium-D-ribose collisions.

نویسندگان

  • D Almeida
  • F Ferreira da Silva
  • G García
  • P Limão-Vieira
چکیده

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(-) (16 m/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.

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عنوان ژورنال:
  • The Journal of chemical physics

دوره 139 11  شماره 

صفحات  -

تاریخ انتشار 2013