Double ionization of water molecules by proton impact: the role of the direct ionization mechanism

Oubaziz, D.; Boulifa, Rachida; Aitelhadjali, Zakia; Champion, C.

doi:10.1140/epjd/e2018-80307-9

Cited by 5 publications

(2 citation statements)

References 58 publications

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“…Charge exchange processes, or electron loss/capture, can also lead to multiple ionsation. These processes show different dependencies with the impact parameter and energy of the projectile [27][28][29][30]. In the present experiment, we were not able to separate out these processes, and the data presented here are integrated over all processes.…”

Section: Methodsmentioning

confidence: 68%

Orientation dependence of multiple ionisation of a diatomic molecule under proton impact

Sharma

Bapat

Bhatt

et al. 2019

J. Phys. B: At. Mol. Opt. Phys.

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Fragmentation of multiply ionised molecular ions is investigated using the coincidence momentum imaging technique in an experiment involving proton–CO collisions over the energy range 25–200 keV. From the measured momentum vectors of the fragment ions, the orientation angle—that is the angle between the axis of the molecule and the direction of the projectile at the instant of collision—is determined under the axial recoil approximation. The multiple ionisation yield is found to strongly depend on the orientation angle, giving rise to an anisotropy as well as a forward–backward asymmetry, reflecting the heteronuclear nature of the CO target. A simple model is used to calculate the probability of multiple ionisation, involving Rutherford-like trajectories with an orientation dependent distance of closest approach and an impact parameter dependent single ionisation probability. The computed probabilities show an orientation dependence which agrees closely with experimental observations.

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Section: Methodsmentioning

confidence: 68%

Orientation dependence of multiple ionisation of a diatomic molecule under proton impact

Sharma

Bapat

Bhatt

et al. 2019

J. Phys. B: At. Mol. Opt. Phys.

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show abstract

“…Charge exchange can be a non-negligible contribution to electron removal at these energies and these processes show different dependencies with the impact parameter and energy of the projectile [19,20,40,41]. Mizuno et al [23] presented the result for orientation dependence of molecule fragmentation in charge exchange processes.…”

Section: Methodsmentioning

confidence: 99%

Anisotropy in multiple ionisation of CO by ion collisions at intermediate interaction strengths

Sharma

Bapat

Bhatt

et al. 2018

J. Phys. B: At. Mol. Opt. Phys.

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Multiple ionisation of the CO molecule following the impact of 100-700 keV He 2+ ions was studied. Fragments arising from the dissociation of n CO 5)were recorded using the coincidence momentum imaging technique. By measuring the angular distribution of the fragment ions in coincidence, and applying the axial recoil approximation, the angle between the axis of the molecule and the direction of the projectile was determined. Strong anisotropy was observed for high degree of ionisation. The dependence of the anisotropy on the interaction strength and the projectile energy was studied and the results were compared with the predicted values in the literature for diatomic molecules. Furthermore, an asymmetry in the angular distribution owing to the heteronuclear nature of the molecule was observed and quantified, showing that the anisotropy is not entirely a geometric effect as has been presented in earlier works.

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Ionization and electron capture for H+ collisions at low keV energy with a water-vapor target

Legorreta

López-Patiño

Fuentes

et al. 2019

International Journal of Mass Spectrometry

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Double ionization of water molecules by proton impact: the role of the direct ionization mechanism

Cited by 5 publications

References 58 publications

Orientation dependence of multiple ionisation of a diatomic molecule under proton impact

Orientation dependence of multiple ionisation of a diatomic molecule under proton impact

Anisotropy in multiple ionisation of CO by ion collisions at intermediate interaction strengths

Ionization and electron capture for H+ collisions at low keV energy with a water-vapor target

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