Solar-wind protons and heavy ions sputtering of lunar surface materials

Barghouty, A. F.; Meyer, F. W.; Harris, Peter R; Adams, J. H.

doi:10.1016/j.nimb.2010.12.033

Cited by 33 publications

(54 citation statements)

References 29 publications

(65 reference statements)

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“…The minority constituents of the solar wind have significantly higher kinetic sputtering yields at solar wind velocities because of the larger mass [3] which are further enhanced by potential sputtering processes [4], since they are all multiply charged.…”

Section: Kinetic and Potential Sputteringmentioning

confidence: 99%

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Kinetic and potential sputtering of lunar regolith: The contribution of the heavy (minority) solar wind ions

Meyer¹,

Harris²,

Meyer³

et al. 2013

AIP Conference Proceedings

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Articles you may be interested in X-ray enhanced sputter rates in argon cluster ion sputter-depth profiling of polymersa) Formation of doubly positively charged diatomic ions of Mo 2 2+ produced by Ar + sputtering of an Mo metal surface Abstract. In this paper the sputtering of lunar regolith by protons and solar wind heavy ions is considered. From preliminary measurements of H + , Ar +1 , Ar +6 and Ar +9 ion sputtering of JSC-1A AGGL lunar regolith simulant at solar wind velocities, and TRIM simulations of kinetic sputtering yields, the relative contributions of kinetic and potential sputtering contributions are estimated. An 80-fold enhancement of oxygen sputtering by Ar + over same-velocity H + , and an additional x2 increase for Ar +9 over same-velocity Ar + was measured. This enhancement persisted to the maximum fluences investigated (~10 16 /cm 2 ). Modeling studies including the enhanced oxygen ejection by potential sputtering due to the minority heavy ion multicharged ion solar wind component, and the kinetic sputtering contribution of all solar wind constituents, as determined from TRIM sputtering simulations, indicate an overall 35% reduction of near-surface oxygen abundance. XPS analyses of simulant samples exposed to singly and multicharged Ar ions show the characteristic signature of reduced (metallic) Fe, consistent with the preferential ejection of oxygen atoms that can occur in potential sputtering of some metal oxides.

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Section: Kinetic and Potential Sputteringmentioning

confidence: 99%

“…As discussed in Ref. [3], knowledge of the latter is essential for comparison with other space-weathering processes such as micrometeorite impact.…”

Section: Kinetic and Potential Sputteringmentioning

confidence: 99%

Kinetic and potential sputtering of lunar regolith: The contribution of the heavy (minority) solar wind ions

Meyer¹,

Harris²,

Meyer³

et al. 2013

AIP Conference Proceedings

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“…For the insulator, the sputtering yield linearly increases with the ion potential energy [10]. In the solar wind, except the proton component that represents about 93% of the charged particle flux, the remaining 7% is distributed among the major solar wind heavier ions (He through Ar [11]). These heavy elements in the solar wind are usually multicharged (e.g., O 6+ and Fe 10+ ), thus their internal energy can enhance the sputtering yield of nonconducting grains by a potential sputtering mechanism [11]- [13].…”

Section: Introductionmentioning

confidence: 99%

“…In the solar wind, except the proton component that represents about 93% of the charged particle flux, the remaining 7% is distributed among the major solar wind heavier ions (He through Ar [11]). These heavy elements in the solar wind are usually multicharged (e.g., O 6+ and Fe 10+ ), thus their internal energy can enhance the sputtering yield of nonconducting grains by a potential sputtering mechanism [11]- [13]. This potential sputtering may significantly alter the total sputtering yield (e.g., of the lunar surface oxides) despite their low abundances relative to protons [4], [14].…”

Section: Introductionmentioning

confidence: 99%

“…This potential sputtering may significantly alter the total sputtering yield (e.g., of the lunar surface oxides) despite their low abundances relative to protons [4], [14]. When both kinetic and potential sputterings are taken into account, Barghouty et al [11] reported that heavy ions contribute to the lunar regolith sputtering by 26% without the potential sputtering and by 52% including that.…”

Section: Introductionmentioning

confidence: 99%

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Sputtering of Spherical SiO₂Samples

Vysinka

Němeček

Šafránková

et al. 2016

IEEE Trans. Plasma Sci.

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Dust grains in the interplanetary environment can be basically found in two locations-floating in the free space or attached to a surface of asteroids, comets, or moons. They are sputtered by the impacts of energetic ions, and this process supplies the interplanetary space with heavy elements. The sputtering yield is generally estimated on the basis of laboratory investigations of planar samples. We use silica micrometersized spherical grains as a prototype of a space-borne dust, bombard them by 2-keV Ar ions, and monitor the influences of simultaneous application of the electron beam as well as the electric field at the dust surface on the sputtering yield. We found that the increase in the sputtering yield due to the electron impact is much larger than expected and it can enhance the sputtering yield by a factor of 1.6 in a comparison with the sole ion bombardment. On the other hand, the influence of the electric field is not so strong (if any) and it is masked by electron impacts in our experiment. Sputtering of the grains fixed at a surface by 30-keV Ga ions revealed that the angular profile of the yield is flatter than that frequently used for a description of the sputtering process. Finally, we compare these results with the published sputtering yield values.

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Anisotropic solar wind sputtering of the lunar surface induced by crustal magnetic anomalies

Poppe

Sarantos

Halekas

et al. 2014

Geophysical Research Letters

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The lunar exosphere is generated by several processes each of which generates neutral distributions with different spatial and temporal variability. Solar wind sputtering of the lunar surface is a major process for many regolith‐derived species and typically generates neutral distributions with a cosine dependence on solar zenith angle. Complicating this picture are remanent crustal magnetic anomalies on the lunar surface, which decelerate and partially reflect the solar wind before it strikes the surface. We use Kaguya maps of solar wind reflection efficiencies, Lunar Prospector maps of crustal field strengths, and published neutral sputtering yields to calculate anisotropic solar wind sputtering maps. We feed these maps to a Monte Carlo neutral exospheric model to explore three‐dimensional exospheric anisotropies and find that significant anisotropies should be present in the neutral exosphere depending on selenographic location and solar wind conditions. Better understanding of solar wind/crustal anomaly interactions could potentially improve our results.

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Solar-wind protons and heavy ions sputtering of lunar surface materials

Cited by 33 publications

References 29 publications

Kinetic and potential sputtering of lunar regolith: The contribution of the heavy (minority) solar wind ions

Kinetic and potential sputtering of lunar regolith: The contribution of the heavy (minority) solar wind ions

Sputtering of Spherical SiO₂Samples

Anisotropic solar wind sputtering of the lunar surface induced by crustal magnetic anomalies

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Solar-wind protons and heavy ions sputtering of lunar surface materials

Cited by 33 publications

References 29 publications

Kinetic and potential sputtering of lunar regolith: The contribution of the heavy (minority) solar wind ions

Kinetic and potential sputtering of lunar regolith: The contribution of the heavy (minority) solar wind ions

Sputtering of Spherical SiO2Samples

Anisotropic solar wind sputtering of the lunar surface induced by crustal magnetic anomalies

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Sputtering of Spherical SiO₂Samples