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On the mechanism of anion desorption from DNA induced by low energy electrons
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10.1063/1.2338320
/content/aip/journal/jcp/125/14/10.1063/1.2338320
http://aip.metastore.ingenta.com/content/aip/journal/jcp/125/14/10.1063/1.2338320

Figures

Image of FIG. 1.
FIG. 1.

(Color online) The molecular structure of tetramer GCAT and schematic diagram of desorption of ions from tetramer oligomers physisorbed and lyophilized on the tantalum substrate.

Image of FIG. 2.
FIG. 2.

(Color online) Schematic view of the experimental setup.

Image of FIG. 3.
FIG. 3.

ion yield from desorption induced by electrons incident on GCAT physisorbed on a tantalum substrate as a function of different thicknesses of films. Each data point corresponds to a new film.

Image of FIG. 4.
FIG. 4.

Desorption of ions from a GCAT film with thickness of along one of the film’s coordinates. The surface was scanned by electrons with kinetic energy of and a transmitted current of before (open circle) and after (solid circle) electron irradiation. An electron beam with energy between 3 and and a transmitted current of irradiated a sample during at a fixed position.

Image of FIG. 5.
FIG. 5.

(Color online) The ion yield function from the GCAT film and the corresponding anions observed from thymine (T) and adenine (A) in gas-phase experiments (Refs. 24, 28, and 29). The lines through the data points serve only as a guide to the eye. The solid circles on the thymine molecule show the position of hydrogen loss observed from thymine as a part of the DNA, while the dashed ones correspond only to the loss from thymine in the gas phase.

Image of FIG. 6.
FIG. 6.

(Color online) The ion yield function from the GCAT film and the summation (, dashed line) of ion yields for corresponding anions observed from nucleobases in the gas phase and from a film . The solid circles show the positions of oxygen loss in DNA.

Image of FIG. 7.
FIG. 7.

(Color online) The ion yield function from GCAT and films . The solid circles show the hydroxyl group desorbed from the DNA.

Image of FIG. 8.
FIG. 8.

(Color online) The ion yield function from a film of GCAT and the summation of the ion yields for corresponding anions observed from nucleobases in the gas phase . The fragments of thymine marked with solid and dashed lines show the possible reaction pathways observed for DEA to DNA and those observed only for a nucleobase in the gas phase, respectively. The solid circles on the thymine molecule show the CN fragment loss available in DNA, whereas the dashed one only existing in the gas phase.

Image of FIG. 9.
FIG. 9.

(Color online) The ion yield function from a film of GCAT and the summation of ion yields for corresponding anions observed from nucleobases in the gas phase . The fragments of thymine marked with solid and dashed lines show the possible reaction pathways observed for DEA to DNA and those observed only for nucleobase in the gas phase, respectively. The solid circles on the thymine molecule show the CNO fragment loss available in DNA, whereas the dashed one only exists in the gas phase.

Tables

Generic image for table
Table I.

The absolute partial cross section values for negative ions formed in dissociative electron attachment to nucleobases in the gas phase. The values in brackets indicate electron energy positions of resonant peaks. The “” denotes no data available.

Generic image for table
Table II.

Electron energy of the peaks and desorption yields for observed ions. The value of ion yield is the average of five electron energy scans with an uncertainty of about 10%.

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/content/aip/journal/jcp/125/14/10.1063/1.2338320
2006-10-12
2014-04-24
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: On the mechanism of anion desorption from DNA induced by low energy electrons
http://aip.metastore.ingenta.com/content/aip/journal/jcp/125/14/10.1063/1.2338320
10.1063/1.2338320
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