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:10.1016/0167-2584(84)90177-4

Cited by 1 publication

(2 citation statements)

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“…The desorption of hydrogen and deuterium cations induced by LEE impact on 1–40‐ML film of H 2 O and D 2 O, respectively, has been reported by many authors (Stockbauer et al, 1982; Rosenberg et al, 1983; Ding et al, 1984; Bertel et al, 1985; Noell, Melius, & Stulen, 1985; Stulen & Thiel, 1985; Bennett et al, 1991; Sieger, Simpson, & Orlando, 1997, 1998). The energy dependence of the total yield and the velocity distribution were recorded by Sieger, Simpson, & Orlando (1997) as a function of film thickness, temperature, and ice phase from 90 to 200 K. The D + yields were found to change as a function of these parameters.…”

Section: Resultsmentioning

confidence: 78%

“…Threshold A has been assigned to deep‐valence excitation followed by a shake‐up to two‐hole‐one‐electron (2h1e) dissociative excited states, (Noell, Melius, & Stulen, 1985; Stulen & Thiel, 1985; Bennett et al, 1991). Threshold B has been tentatively assigned to valence excitation plus shake‐off to form two‐hole (2h) states, which dissociate via a Coulomb explosion (Rosenberg et al, 1983; Ding et al, 1984; Bertel et al, 1985; Stulen & Thiel, 1985). The insets show the onset of emission at low and high temperatures.…”

Section: Resultsmentioning

confidence: 99%

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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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