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Hyperthermal nitrogen ion scattering damage to D-ribose and 2-deoxy-D-ribose films
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10.1063/1.2772259
/content/aip/journal/jcp/127/14/10.1063/1.2772259
http://aip.metastore.ingenta.com/content/aip/journal/jcp/127/14/10.1063/1.2772259

Figures

Image of FIG. 1.
FIG. 1.

Typical cation and anion fragment patterns (insets) of ion stimulated desorption of D-ribose films on Pt substrate induced by (a) , (b) , and (c) ion irradiations. There is a break in the ordinate of the anion spectra in order to show the low yield anions. Note the formation of ion in all cases and the formation of anion in insets of (b) and (c).

Image of FIG. 2.
FIG. 2.

Major cation fragments produced by ion irradiation of (a) D-ribose, (b) D-ribose, and (c) 1-D D-ribose films. Each column shows a different segment of mass spectra.

Image of FIG. 3.
FIG. 3.

Desorption energy thresholds of major cation and anion fragments produced by (a) and (b) ion irradiations of D-ribose films. All ion yields are normalized to intensity at for ease of comparison. Similar desorption energy thresholds are found for fragments of 2-deoxy-D-ribose films. The yield tail of during ion irradiation is due to contribution of (see text). The experimental uncertainty is about for the obtained threshold values.

Image of FIG. 4.
FIG. 4.

Desorption energy thresholds of (a) and (b) ions during and ion irradiations of D-ribose (R) and 2-deoxy-D-ribose (dR) films. All ion yields are normalized to intensity at for ease of comparison.

Image of FIG. 5.
FIG. 5.

Mass spectra of anion fragments in between 13 and measured during (a) and (b) ion irradiations of D-ribose at several different energies. The fragment at in (a) is clearly assigned to ion as a result of hydrogen abstraction by ion, which is not seen during ion irradiation. The fragment at in (a) has a contribution from ion, particularly in the low energy range.

Image of FIG. 6.
FIG. 6.

(a) Desorption energy thresholds of produced by and ion irradiations of D-ribose films. Similar desorption energy thresholds are found from 2-deoxy-D-ribose films. The lower desorption energy threshold during ion irradiation is due likely to the interaction of an ionic nitrogen atom. Desorption energy threshold of during ion irradiation of 1-D D-ribose film is also shown, which suggests desorption from C–H. (b) Desorption energy thresholds of , , and produced by ion irradiation of 1-D D-ribose films. All ion yields are normalized to intensity at for ease of comparison.

Tables

Generic image for table
Table I.

Branching ratios of typical cation fragments originating from specific sites (in %). The ratios are mean values obtained between 30 and ion irradiation of (C5) and 1-D (C1) D-ribose. The numbers in parentheses indicate the number of possible formation channels from that particular site(s) (Ref. 13).

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/content/aip/journal/jcp/127/14/10.1063/1.2772259
2007-10-12
2014-04-21
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Hyperthermal (1–100eV) nitrogen ion scattering damage to D-ribose and 2-deoxy-D-ribose films
http://aip.metastore.ingenta.com/content/aip/journal/jcp/127/14/10.1063/1.2772259
10.1063/1.2772259
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