Notizen: A Redetermination of the Isotopic Composition of Atmospheric Neon

Eberhardt, P.; Eugster, O.; Marti, K.

doi:10.1515/zna-1965-0420

Cited by 221 publications

(144 citation statements)

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“…Isotopic ratios of rare gases in the atmospheric air Observed isotopic ratios of Ne and Ar in the atmospheric air are shown in Table 2-a. Accuracy and precision of the measurements are also shown together with literature values (EBERHARDT et al, 1965 andNIER, 1950). In general the observed values agree with those in the literatures.…”

Section: Rare Gas Purificationsupporting

confidence: 88%

Elemental and isotopic abundances of rare gases in natural gases obtained by a quadrupole mass spectrometer.

1982

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An attempt was made to determine both elemental and isotopic abundances of rare gases in natural gases by means of a conventional quadrupole mass spectrometer (QMS). Elemental abundances and iso topic ratios of Ar, Kr and Xe on the atmospheric concentration level were successfully measured by the present method. Reproducibility of 10-20% was obtained for 'He, 20Ne, 36Ar, 84Kr and 132Xe measure ments. Isotopic ratios of Ar, Kr and Xe were determined within about 2% experimental errors, except for 78Kr/84Kr , '24Xe/132Xe and 126Xe/132Xe. Sensitivity and reproducibility of the measurements were examined by repeating runs of the atmospheric air.In order to verify. the applicability of the present method to terrestrial natural gas analyses, eight typical samples of natural gases in Japan, with differences in major compositions, were measured. The values observed by a QMS in this work are generally in good agreement with those obtained by magnetic deflec tion mass spectrometers. Enrichment of radiogenic 40Ar was observed in some C02-rich natural gas samples. Observed Kr and Xe isotopic ratios in N2-rich gases and CH4-rich gases coincided with the atmospheric ratios within experimental error.

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Section: Rare Gas Purificationsupporting

confidence: 88%

Elemental and isotopic abundances of rare gases in natural gases obtained by a quadrupole mass spectrometer.

1982

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“…The 4 He concentration of this grain ([20.7 ± 12.7] × 10 −3 cm 3 g −1 ) is lower than the concentrations measured in most individual SiC grains (Nichols et al 1992;Heck et al 2007). The 4 He/ 22 Ne ratio of [8.4 ± 5.8] × 10 −2 is several orders of magnitude lower than those determined in single SiC grains (Heck et al 2007; see Section 4.1 for discussion) and also lower than 4 He/ 22 Ne of the terrestrial atmosphere (3.2 × 10 −1 ; Eberhardt et al 1965;Mamyrin et al 1970).…”

Section: Helium-4mentioning

confidence: 79%

“…Although we observed a large amount of 22 Ne (∼5 × 10 −13 cm 3 STP) from this sample, we did not detect any 20 Ne. This excludes that terrestrial Ne has been released ( 20 Ne/ 22 Ne air = 9.8; Eberhardt et al 1965) from the neighboring dust and implies that the 22 Ne measured in grain 64-1 is presolar.…”

Section: Helium-4mentioning

confidence: 99%

Ne ISOTOPES IN INDIVIDUAL PRESOLAR GRAPHITE GRAINS FROM THE MURCHISON METEORITE TOGETHER WITH He, C, O, Mg-Al ISOTOPIC ANALYSES AS TRACERS OF THEIR ORIGINS

Heck

Amari

Hoppe

et al. 2009

ApJ

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Ne isotopes measured in individual presolar graphite grains, solid samples of extinct stars preserved in primitive meteorites, provide information on the type of stellar sources of the grains and on nucleosynthetic mixing and ion-trapping processes which were operating. We present Ne and He isotope analyses of single presolar graphite grains from the KFB1 density fraction extracted from the carbonaceous chondrite Murchison. In addition, we measured isotopes of C, O, and Mg-Al with the NanoSIMS ion microprobe to better constrain the origin of the grains. Eleven out of 51 presolar graphite grains contain nucleosynthetic 22 Ne above our detection limit. This fraction of 22 Ne-rich grains is similar to the one reported by Nichols et al. although we have a lower 22 Ne detection limit. We detected rare He-shell 20 Ne in one 22 Ne-rich grain and obtained the 20 Ne/ 22 Ne ratio (0.03 ± 0.02) of the He-shell of an Asymptotic Giant Branch (AGB) star with 1.5-2 M and subsolar metallicity. We also detected 4 He in this grain, while in the other grains, which originally acquired He, He-loss seems to be significant. We found unequivocal evidence for radiogenic 22 Ne (Ne-R) in another graphite grain, which likely condensed in a core-collapse supernova and which incorporated live radioactive 22 Na (t 1/2 = 2.6 yr). For the other grains, a clear assignment to a stellar source is more difficult to make. Putative stellar sources are supernovae, AGB stars, born-again AGB stars, J-type carbon stars, and CO novae.

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“…Helium and neon concentrations and isotopic ratios of batches of relict chromite grains a extracted from a fossil meteorite, of sediment-dispersed extraterrestrial chromite grains and of chromites extracted from modern ordinary chondrites. c Solar wind (Geiss et al 2004) and air (Eberhardt et al 1965;Mamyrin et al 1970) compositions are given for comparison.…”

Section: Bulk Meteorite Samplesmentioning

confidence: 99%

“…At the higher end are stratospheric IDPs (references given in legend). Air (Eberhardt et al 1965) and solar wind (Geiss et al 2004) compositions are given as straight lines. Errors are 1σ (not shown if smaller than symbols).…”

Section: Solar Noble Gasesmentioning

confidence: 99%

Noble gases in fossil micrometeorites and meteorites from 470 Myr old sediments from southern Sweden, and new evidence for the L‐chondrite parent body breakup event

Heck

Schmitz

Baur

et al. 2008

Meteorit & Planetary Scien

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Abstract-We present noble gas analyses of sediment-dispersed extraterrestrial chromite grains recovered from ~470 Myr old sediments from two quarries (Hällekis and Thorsberg) and of relict chromites in a coeval fossil meteorite from the Gullhögen quarry, all located in southern Sweden. Both the sediment-dispersed grains and the meteorite Gullhögen 001 were generated in the Lchondrite parent body breakup about 470 Myr ago, which was also the event responsible for the abundant fossil meteorites previously found in the Thorsberg quarry. Trapped solar noble gases in the sediment-dispersed chromite grains have partly been retained during ~470 Myr of terrestrial residence and despite harsh chemical treatment in the laboratory. This shows that chromite is highly retentive for solar noble gases. The solar noble gases imply that a sizeable fraction of the sedimentdispersed chromite grains are micrometeorites or fragments thereof rather than remnants of larger meteorites. The grains in the oldest sediment beds were rapidly delivered to Earth likely by direct injection into an orbital resonance in the inner asteroid belt, whereas grains in younger sediments arrived by orbital decay due to Poynting-Robertson (P-R) drag. The fossil meteorite Gullhögen 001 has a low cosmic-ray exposure age of ~0.9 Myr, based on new He and Ne production rates in chromite determined experimentally. This age is comparable to the ages of the fossil meteorites from Thorsberg, providing additional evidence for very rapid transfer times of material after the L-chondrite parent body breakup.

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Notizen: A Redetermination of the Isotopic Composition of Atmospheric Neon

Abstract: A redetermination of the isotopic composition of atmospheric neon gave abundance ratios

Cited by 221 publications

References 0 publications

Elemental and isotopic abundances of rare gases in natural gases obtained by a quadrupole mass spectrometer.

Elemental and isotopic abundances of rare gases in natural gases obtained by a quadrupole mass spectrometer.

Ne ISOTOPES IN INDIVIDUAL PRESOLAR GRAPHITE GRAINS FROM THE MURCHISON METEORITE TOGETHER WITH He, C, O, Mg-Al ISOTOPIC ANALYSES AS TRACERS OF THEIR ORIGINS

Noble gases in fossil micrometeorites and meteorites from 470 Myr old sediments from southern Sweden, and new evidence for the L‐chondrite parent body breakup event

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