Energy distribution of H+ ions with esd of water adsorbed at aluminium and tungsten surfaces

Ding, M.Q.; Williams, E. J.; Adrados, J. P.; Segovia, J.L. de

doi:10.1016/0039-6028(84)90729-5

Cited by 17 publications

(3 citation statements)

References 18 publications

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“…Two major thresholds are evident, denoted A (ϳ22-24 eV͒ and B (ϳ40 eV͒. Our results are in agreement with earlier measurements, [38][39][40][41][42][43][44] which observed an onset at 20-21 eV and a rapid rise at 24-25 eV for proton ESD and PSD from amorphous H 2 O ice. Threshold A has been assigned to deep valence excitation followed by shake-up to two-hole-one-electron (2h1e) dissociative excited states.…”

Section: Resultssupporting

confidence: 92%

“…Previous low-energy ͑5-150 eV͒ ESD and PSD studies of amorphous H 2 O/D 2 O ice surfaces have examined the stimulated production of H 2 /D 2 , 34 D and O, 5 H Ϫ /D Ϫ , 35,36 and H ϩ /D ϩ . [37][38][39][40][41][42][43][44][45][46] Some studies of H ϩ ESD from H 2 O ice reported a threshold near 20-25 eV and several desorption pathways, whose relative importance depended upon the excitation energy. 38,39 The excitations responsible for cation emission have been assigned to two-hole one-electron (2h1e) shake-up and twohole (2h) configurations.…”

Section: Introductionmentioning

confidence: 99%

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Electron-stimulated desorption of D+from D2O ice: Surface structure and electronic excitations

1997

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We present a study of the electron-stimulated desorption of deuterium cations ͑D ϩ) from thin ͑1-40 ML͒ D 2 O ice films vapor deposited on a Pt͑111͒ substrate. Measurements of the total yield and velocity distributions as a function of temperature from 90 to 200 K show that the D ϩ yield changes with film thickness, surface temperature, and ice phase. We observe two energy thresholds for cation emission, near 25 and 40 eV, which are weakly dependent upon the ice temperature and phase. The cation time-of-flight ͑TOF͒ distribution is at least bimodal, indicating multiple desorption channels. A decomposition of the TOF distributions into ''fast'' and ''slow'' channels shows structure as a function of excitation energy, film thickness, and temperature. The D ϩ yield generally increases with temperature, rising near 120 K on amorphous ice, and near 135 K on crystalline ice. The amorphous-crystalline phase transition at ϳ160 K causes a drop in total desorption yield. The temperature dependence of D Ϫ desorption via the 2 B 1 dissociative electron attachment resonance is very similar to the slow D ϩ yield, and likely involves similar restructuring and lifetime effects. The data collectively suggest that a thermally activated reduction of surface hydrogen bonding increases the lifetime of the excited states responsible for ion desorption, and that these lifetime effects are strongest for excited states involving a 1 bands ͓S0163-1829͑97͒05931-6͔

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Section: Resultssupporting

confidence: 92%

Section: Introductionmentioning

confidence: 99%

Electron-stimulated desorption of D+from D2O ice: Surface structure and electronic excitations

1997

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“…Similar data were observed for a thick Au target. On the other hand, the 500 eV electron impact data (open circles) was reported by Ding, et al [ 6 ] using water adsorbed on aluminum as a target. The same group has also obtained essentially the same H+ kinetic energy distribution from a tungsten sample using a 150 eV electron beam.…”

Section: Figurementioning

confidence: 86%

Hydrogen Ions Emission Under Fast Charged Particles : The Beginning of the Desorption Process

1989

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Nanoscopic aspects of radiobiological damage: Fragmentation induced by secondary low‐energy electrons

Sanche

2002

Mass Spectrometry Reviews

225

165

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Low-energy electrons (LEEs) are produced in large quantities in any type of material irradiated by high-energy particles. In biological media, these electrons can fragment molecules and lead to the formation of highly reactive radicals and ions. The results of recent experiments performed on biomolecular films bombarded with LEEs under ultra-high vacuum conditions are reviewed in the present article. The major type of experiments, which measure fragments produced in such films as a function of incident electron energy (0.1-45 eV), are briefly described. Examples of the results obtained from DNA films are summarized along with those obtained from the fragmentation of elementary components of the DNA molecule (i.e., thin solid films of H(2)O, DNA bases, sugar analogs, and oligonucleotides) and proteins. By comparing the results of these different experiments, it is possible to determine fundamental mechanisms that are involved in the dissociation of biomolecules and the production of single- and double-strand breaks in DNA, and to show that base damage is dependent on the nature of the bases and on their sequence context. Below 15 eV, electron resonances (i.e., the formation of transient anions) play a dominant role in the fragmentation of all biomolecules investigated. These transient anions fragment molecules by decaying into dissociative electronically excited states or by dissociating into a stable anion and a neutral radical. These fragments usually initiate other reactions with nearby molecules, causing further chemical damage. The damage caused by transient anions is dependent on the molecular environment.

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Energy distribution of H+ ions with esd of water adsorbed at aluminium and tungsten surfaces

Cited by 17 publications

References 18 publications

Electron-stimulated desorption of D+from D2O ice: Surface structure and electronic excitations

Electron-stimulated desorption of D+from D2O ice: Surface structure and electronic excitations

Hydrogen Ions Emission Under Fast Charged Particles : The Beginning of the Desorption Process

Nanoscopic aspects of radiobiological damage: Fragmentation induced by secondary low‐energy electrons

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