Understanding heterogeneity in Genesis diamond-like carbon film using SIMS analysis of implants

Jurewicz, A. J. G.; Burnett, D. S.; Rieck, K. D.; Hervig, R. L.; Friedmann, T. A.; Williams, Peter W.; Daghlian, Charles P.; Wiens, R. C.

doi:10.1007/s10853-017-1267-3

Cited by 7 publications

(33 citation statements)

References 24 publications

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“…An empirical result for Mg + ions (reported in Jurewicz et al. ) is that more of the ions are stopped near the collector surface than predicted by SRIM, and our modeling of the shallow part of the profile would miss a fraction of the implanted solar wind ions. This effect could be greater for regimes with lower energy solar wind (L and B/C arrays), as implied by the comparison of our data with the GIM results.…”

Section: Discussionmentioning

confidence: 70%

Hydrogen fluence in Genesis collectors: Implications for acceleration of solar wind and for solar metallicity

Huss

Koeman-Shields

Jurewicz

et al. 2019

Meteorit & Planetary Scien

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NASA's Genesis mission was flown to capture samples of the solar wind and return them to the Earth for measurement. The purpose of the mission was to determine the chemical and isotopic composition of the Sun with significantly better precision than known before. Abundance data are now available for noble gases, magnesium, sodium, calcium, potassium, aluminum, chromium, iron, and other elements. Here, we report abundance data for hydrogen in four solar wind regimes collected by the Genesis mission (bulk solar wind, interstream low‐energy wind, coronal hole high‐energy wind, and coronal mass ejections). The mission was not designed to collect hydrogen, and in order to measure it, we had to overcome a variety of technical problems, as described herein. The relative hydrogen fluences among the four regimes should be accurate to better than ±5–6%, and the absolute fluences should be accurate to ±10%. We use the data to investigate elemental fractionations due to the first ionization potential during acceleration of the solar wind. We also use our data, combined with regime data for neon and argon, to estimate the solar neon and argon abundances, elements that cannot be measured spectroscopically in the solar photosphere.

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Section: Discussionmentioning

confidence: 70%

Hydrogen fluence in Genesis collectors: Implications for acceleration of solar wind and for solar metallicity

Huss

Koeman-Shields

Jurewicz

et al. 2019

Meteorit & Planetary Scien

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“…Moreover, transient sputtering effects in DoS standards were shown to be 4 nm or less for the SIMS conditions used here (Jurewicz et al. 2017a, 2017b). For comparison, observations during SIMS analysis of silicon under similar conditions produced transient sputtering zones of 8–12 nm.…”

Section: Experimental: Materials and Techniquesmentioning

confidence: 80%

“…Nevertheless, the effect of variations in the DLC structure and composition on SIMS analysis of Genesis DoS collectors reported by Jurewicz et al. (2017a, 2017b) still apply. The need to accommodate these matrix effects in isotopic analyses shaped the data reduction technique used herein.…”

Section: Experimental: Materials and Techniquesmentioning

confidence: 99%

“…Even more has been learned about the reduction of SIMS data since Jurewicz et al. (2017a, 2017b). For example, fig.…”

Section: Experimental: Materials and Techniquesmentioning

confidence: 99%

“…Instead, in‐house work has shown that the surface correction of Jurewicz et al. (2017a, 2017b) left some ion‐milled surface contamination in the SW data: although a small number of counts, the effect on the fluences was significant because the SW is present in trace concentrations. Nevertheless, the effect of variations in the DLC structure and composition on SIMS analysis of Genesis DoS collectors reported by Jurewicz et al.…”

Section: Experimental: Materials and Techniquesmentioning

confidence: 99%

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Magnesium isotopes of the bulk solar wind from Genesis diamond‐like carbon films

Jurewicz

Rieck

Hervig

et al. 2020

Meteorit & Planetary Scien

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NASA's Genesis Mission returned solar wind (SW) to the Earth for analysis to derive the composition of the solar photosphere from solar material. SW analyses control the precision of the derived solar compositions, but their ultimate accuracy is limited by the theoretical or empirical models of fractionation due to SW formation. Mg isotopes are “ground truth” for these models since, except for CAIs, planetary materials have a uniform Mg isotopic composition (within ≤1‰) so any significant isotopic fractionation of SW Mg is primarily that of SW formation and subsequent acceleration through the corona. This study analyzed Mg isotopes in a bulk SW diamond‐like carbon (DLC) film on silicon collector returned by the Genesis Mission. A novel data reduction technique was required to account for variable ion yield and instrumental mass fractionation (IMF) in the DLC. The resulting SW Mg fractionation relative to the DSM‐3 laboratory standard was (−14.4‰, −30.2‰) ± (4.1‰, 5.5‰), where the uncertainty is 2ơ SE of the data combined with a 2.5‰ (total) error in the IMF determination. Two of the SW fractionation models considered generally agreed with our data. Their possible ramifications are discussed for O isotopes based on the CAI nebular composition of McKeegan et al. (2011).

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Enhancement in the tribological properties of Cr/DLC multilayers in methane: structural transformation induced by sliding

et al. 2019

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Diamond-like carbon (DLC) films respond as a lubricating material under some atmosphere conditions, such as N 2 , moisture. Nevertheless, incomplete knowledge about the key factors, which control the performances of film under distinct gases, limits the further use of them. Herein, the tribological properties of DLC film and Cr/DLC multilayers with different modulation periods were studied under methane. Frictional tests conducted under methane show that Cr/ DLC film exhibits a great reduction in friction and wear compared to that of DLC film. An interpretation for tribological performances of films was proposed by considering repassivation and structural transformation taking place at the sliding interface. It is chemical passivation that plays a major role in the tribological properties of DLC film, while the Cr/ DLC multilayers possess the lower friction coefficient because of the structural transformation induced by shearing. This study is important for broadening applications of DLC film in the industrial field and reducing energy waste.

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Understanding heterogeneity in Genesis diamond-like carbon film using SIMS analysis of implants

Cited by 7 publications

References 24 publications

Hydrogen fluence in Genesis collectors: Implications for acceleration of solar wind and for solar metallicity

Hydrogen fluence in Genesis collectors: Implications for acceleration of solar wind and for solar metallicity

Magnesium isotopes of the bulk solar wind from Genesis diamond‐like carbon films

Enhancement in the tribological properties of Cr/DLC multilayers in methane: structural transformation induced by sliding

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