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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21 September 2013
Research Article|
September 17 2013
Dynamic of negative ions in potassium-D-ribose collisions
D. Almeida;
D. Almeida
1Laboratório de Colisões Atómicas e Moleculares, CEFITEC, Departamento de Física, Faculdade de Ciências e Tecnologia,
Universidade Nova de Lisboa
, 2829-516 Caparica, Portugal
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F. Ferreira da Silva;
F. Ferreira da Silva
1Laboratório de Colisões Atómicas e Moleculares, CEFITEC, Departamento de Física, Faculdade de Ciências e Tecnologia,
Universidade Nova de Lisboa
, 2829-516 Caparica, Portugal
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G. García;
G. García
2Instituto de Física Fundamental,
Consejo Superior de Investigaciones Científicas
, Serrano 113-bis, 28006 Madrid, Spain
3Centre for Medical Radiation Physics,
University of Wollongong
, NSW 2522, Australia
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P. Limão-Vieira
P. Limão-Vieira
a)
1Laboratório de Colisões Atómicas e Moleculares, CEFITEC, Departamento de Física, Faculdade de Ciências e Tecnologia,
Universidade Nova de Lisboa
, 2829-516 Caparica, Portugal
4Centre for Earth, Planetary, Space and Astronomical Research, Department of Physical Sciences,
The Open University
, Walton Hall MK7 6AA, United Kingdom
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D. Almeida
1
F. Ferreira da Silva
1
G. García
2,3
P. Limão-Vieira
1,4,a)
1Laboratório de Colisões Atómicas e Moleculares, CEFITEC, Departamento de Física, Faculdade de Ciências e Tecnologia,
Universidade Nova de Lisboa
, 2829-516 Caparica, Portugal
2Instituto de Física Fundamental,
Consejo Superior de Investigaciones Científicas
, Serrano 113-bis, 28006 Madrid, Spain
3Centre for Medical Radiation Physics,
University of Wollongong
, NSW 2522, Australia
4Centre for Earth, Planetary, Space and Astronomical Research, Department of Physical Sciences,
The Open University
, Walton Hall MK7 6AA, United Kingdom
a)
Author to whom correspondence should be addressed. Electronic mail: [email protected]. Tel.: (+351) 21 294 78 59. Fax: (+351) 21 294 85 49.
J. Chem. Phys. 139, 114304 (2013)
Article history
Received:
June 07 2013
Accepted:
August 25 2013
Citation
D. Almeida, F. Ferreira da Silva, G. García, P. Limão-Vieira; Dynamic of negative ions in potassium-D-ribose collisions. J. Chem. Phys. 21 September 2013; 139 (11): 114304. https://doi.org/10.1063/1.4820949
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