Dynamic of negative ions in potassium-D-ribose collisions

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

http://hdl.handle.net/10362/41820

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Autores

Almeida, D.

Ferreira da Silva, F.

Garcia, G.

Limão-Vieira, P.

Resumo(s)

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.

Descrição

P.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.