Ionization of water by (20–150)-keV protons: Separation of direct-ionization and electron-capture processes

Gobet, F.; Eden, S.; Coupier, B.; Tabet, Jean Claude; Farizon, B.; Farizon, M.; Gaillard, M.J.; Carré, Michel; Ouaskit, S.; Märk, T.D.; Scheier, P.

doi:10.1103/physreva.70.062716

Cited by 80 publications

(114 citation statements)

References 31 publications

(65 reference statements)

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“…The total SI cross sections from Ref. [12] agree with those measured in [17,18,38,39] for formation of H 2 O + . Since the fragmentation of the water cation is not negligible, this comparison indicates, as also pointed out by the authors, that the SI total cross section of Ref.…”

Section: B Total Si and Ep Cross Sectionssupporting

confidence: 71%

“…Both Murakami et al [12] and Illescas et al [10] report total EP cross sections in generally good agreement with the experiments [15][16][17][18], although the maximum of the cross section in the BGM calculations appears at lower impact energy than those of different experiments and theories (continuum distorted wave eikonal initial state [3] and CTMC [10]); the BGM calculation also overestimates the experimental cross section at collision energies below 50 keV. However, the magnitudes of the contributions of SI and multiple electron processes to EP in Refs.…”

Section: +supporting

confidence: 60%

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Ionization of water molecules by proton impact: Two nonperturbative studies of the electron-emission spectra

et al. 2013

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Two nonperturbative methods are applied to obtain total and singly differential (in the electron energy) cross sections of electron emission in proton collisions with H 2 O at impact energies in the range 10 keV E p 5 MeV. Both methods, one classical and one semiclassical, combine an independent particle treatment with a multicenter model potential description of the target. The excellent agreement obtained with experimental data supports the usefulness of the approximations involved and encourages the study of more complex systems.

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Section: B Total Si and Ep Cross Sectionssupporting

confidence: 71%

Section: +supporting

confidence: 60%

Ionization of water molecules by proton impact: Two nonperturbative studies of the electron-emission spectra

et al. 2013

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“…Lines correspond to the present calculations and those of Gabás et al [4] and Illescas et al [9]. Solid symbols refer to CT experimental results of Rudd et al [14], Greenwood et al [15], Gobet et al [16], Luna et al [17].…”

Section: Resultsmentioning

confidence: 94%

“…Figure 5 also includes de proton-water CT results of Gabás et al [4], evaluated using a method similar to the one employed here, classical (CTMC) results of Illescas et al [9] and experimental data [14,15,16,17]. We plot the cross section for electron-loss, which is the sum of ionization and CT cross sections [reactions (1) and (2)], because, in general, the separation of CT and ionization fluxes is difficult when using molecular expansions.…”

Section: Resultsmentioning

confidence: 99%

Aggregation effects in proton collisions with water dimers

Ravazzani

Errea

Méndez

et al. 2012

J. Phys.: Conf. Ser.

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Abstract. Charge transfer cross sections in proton collisions with water dimers are calculated using an ab initio method based on molecular orbitals of the system. Results are compared with their counterpart in proton-water collisions to gauge the importance of intermolecular interactions in the cross sections. IntroductionIon collisions with water molecules are basic processes in hadron therapy since they give rise to ionization and fragmentation processes that produce electrons, ions and radicals, which lead to cellular damage by interaction with DNA. Detailed knowledge of ionizing reactions in ion-water collisions is also required for the simulation of the ion motion in the cell medium, where the simulation of the cell conditions requires to consider the interaction of ion projectiles with liquid water. However, previous theoretical and experimental work has focused on ion collisions with gas-phase water.In order to gauge the importance of the interaction between water molecules on the relevant cross sections, we have considered proton collisions with the water dimer. To our knowledge, no other work has studied ion collisions with this species, and only Bouchiha et al [1] carried out calculations for electron-water dimer collisions. A different approach has been applied by Champion [2], who has employed the so-called Polarizable Continuum Model [3] to simulate the interaction of the water molecule involved in electron collisions with the liquid environment. In the present work, we have evaluated total cross sections for charge transfer (CT),

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“…Experimentally, the investigation of water vapour is challenging, but possible [14][15][16][17]. Due to the importance of the water molecule in applied fields (e.g., radiation therapy) one should expect more work to be carried out in this research area in the near future.…”

Section: Introductionmentioning

confidence: 99%

Calculation of Stark resonance parameters for valence orbitals of the water molecule

Laso

Horbatsch

2016

Phys. Rev. A

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An exterior complex scaling technique is applied to compute Stark resonance parameters for two molecular orbitals (1b 1 and 1b 2 ) represented in the field-free limit in a single-center expansion. For electric DC field configurations that guarantee azimuthal symmetry of the solution the calculation is carried out by solving a two-dimensional partial differential equation in spherical polar coordinates using a finite-element method. The resonance positions and widths as a function of electric field strengths are shown for field strengths starting in the tunnelling ionization regime, and extending well into the over-barrier ionization region.

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Ionization of water by (20–150)-keV protons: Separation of direct-ionization and electron-capture processes

Cited by 80 publications

References 31 publications

Ionization of water molecules by proton impact: Two nonperturbative studies of the electron-emission spectra

Ionization of water molecules by proton impact: Two nonperturbative studies of the electron-emission spectra

Aggregation effects in proton collisions with water dimers

Calculation of Stark resonance parameters for valence orbitals of the water molecule

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