Conversion of O2into CO2for High-Precision Oxygen Isotope Measurements

1996 ◽  
Vol 68 (19) ◽  
pp. 3507-3510 ◽  
Author(s):  
Eugeni Barkan ◽  
Boaz Luz
Keyword(s):  
Oxygen Isotope ◽  
High Precision ◽  
Isotope Measurements

High‐Precision, High‐Accuracy Oxygen Isotope Measurements of Zircon Reference Materials with the SHRIMP‐SI

2019 ◽  
Vol 44 (1) ◽  
pp. 85-102 ◽  
Author(s):  
Janaína N. Ávila ◽  
Trevor R. Ireland ◽  
Peter Holden ◽  
Peter Lanc ◽  
Andrew Latimore ◽  
...  
Keyword(s):  
Oxygen Isotope ◽  
High Precision ◽  
Reference Materials ◽  
High Accuracy ◽  
Isotope Measurements

Deciphering the physical mechanism of the topography effect for oxygen isotope measurements using a Cameca IMS-1280 SIMS

2015 ◽  
Vol 30 (4) ◽  
pp. 950-956 ◽  
Author(s):  
Guo-Qiang Tang ◽  
Xian-Hua Li ◽  
Qiu-Li Li ◽  
Yu Liu ◽  
Xiao-Xiao Ling ◽  
...  
Keyword(s):  
Oxygen Isotope ◽  
High Precision ◽  
Physical Mechanism ◽  
Isotope Analysis ◽  
Topography Effect ◽  
Isotope Measurements

Topography effects can be reduced by increasing transfer optics magnification in high precision SIMS isotope analysis.

Recent developments and applications of triple oxygen isotope measurements by secondary ion mass spectrometry

2020 ◽  
Author(s):  
Yves Marrocchi ◽  
Johan Villeneuve ◽  
Paula Peres ◽  
Firmino Fernandes
Keyword(s):  
Mass Spectrometry ◽  
Oxygen Isotope ◽  
High Precision ◽  
Oxygen Isotopes ◽  
Primary Beam ◽  
Isotopic Analyses ◽  
Oxygen Isotopic ◽  
Secondary Ion ◽  
Isotopic Measurements ◽  
Isotope Measurements

<p>Oxygen isotopes are powerful proxies that are commonly used to decipher the formation of terrestrial and extraterrestrial rocks. Most of modern scientific approaches imply the determination of the oxygen isotopic composition at the mineral scale, thus requiring instruments enable to perform in situ, multi-collection, isotopic analyses in complex mineralogical assemblages and zoned minerals. Among them, large-geometry secondary ion mass spectrometer (LG-SIMS) is the most versatile with unique advantages such as (i) high spatial resolution (10–20 μm beam diameter and 1–2 μm depth); (ii) high sensitivity (detection limits below the ppm level for most elements) and (iii) high mass-resolution analysis allowing to remove most isobaric interferences (Villeneuve et al., 2019). Thanks to these capabilities, analytical uncertainties were significantly reduced for oxygen isotopes and reproducibilities much better that 1 ‰ on d<sup>17</sup>O and d<sup>18</sup>O are commonly obtained (e.g., Vacher et al. 2016; Marrocchi et al., 2018). Reaching such precisions is, however, linked to the use of 10<sup>11 </sup>Ω Faraday Cups (FCs) that require minimum count rates of > 10<sup>6</sup> cp/s for reaching permil precisions. This implies performing measurements with relatively large primary beam (i.e., 15-20 μm) that limits the minerals that can be targeted, especially in extraterrestrial samples (e.g., chondrule olivine crystals, Marrocchi et al., 2019).</p><p>Latest generation LG-SIMS instruments have been recently equipped with 10<sup>12 </sup>Ω FCs that enable isotopic measurements to be performed at count rates significantly lower (i.e., 3 × 10<sup>5</sup> cp/s) while maintaining good precision. This implies that high-precision oxygen isotopic measurements can be now performed with a less intense and smaller primary beam (~1 nA; 5 μm), In this contribution, we will report the specific characteristics of measurements using 10<sup>12 </sup>Ω FCs and the reproducibilities obtained for oxygen isotope measurements. Few scientific examples where the use of 10<sup>12 </sup>Ω FCs can represent a significant beakthrough will also be presented.</p><p>Marrocchi Y., Bekaert D.V. & Piani L. (2018). Origin and abundance of water in carbonaceous asteroids. Earth and Planetary Science Letters 482, 23-32.</p><p>Marrocchi Y., Euverte R., Villeneuve J., Batanova V., Welsch B., Ferrière L. & Jacquet E. (2019) Formation of CV chondrules by recycling of amoeboid olivine aggregate-like precursors. Geochimica et Cosmochimica Acta 247C, 121-141.</p><p>Villeneuve J., Chaussidon M., Marrocchi Y., Deng Z. & Watson B.E. (2019). High-precision silicon isotopic analyses by MC-SIMS in olivine and low-Ca pyroxene. Rapid Communication in Mass Spectrometry 33, 1589-1597.</p><p>Vacher L.G., Marrocchi Y., Verdier-Paoletti M., Villeneuve J. & Gounelle M. (2016) Inward radial mixing of interstellar water ices in the solar protoplanetary disk. The Astrophysical Journal Letters, 826, 1-6.</p><p> </p>

Using stable hydrogen and oxygen isotope measurements of feathers to infer geographical origins of migrating European birds

Oecologia ◽  
2004 ◽  
Vol 141 (3) ◽  
pp. 477-488 ◽  
Author(s):  
Keith A. Hobson ◽  
Gabriel J. Bowen ◽  
Leonard I. Wassenaar ◽  
Yves Ferrand ◽  
Hervé Lormee
Keyword(s):  
Oxygen Isotope ◽  
Hydrogen And Oxygen Isotope ◽  
Isotope Measurements

A new method for TIMS high precision analysis of Ba and Sr isotopes for cosmochemical studies

2017 ◽  
Vol 32 (7) ◽  
pp. 1388-1399 ◽  
Author(s):  
Elsa Yobregat ◽  
Caroline Fitoussi ◽  
Bernard Bourdon
Keyword(s):  
Mass Spectrometry ◽  
High Resolution ◽  
High Precision ◽  
Thermal Ionization Mass Spectrometry ◽  
New Method ◽  
Ionization Mass ◽  
Sr Isotopes ◽  
Sr Resin ◽  
Thermal Ionization Mass ◽  
Isotope Measurements

A new protocol using Eichron™ Sr-resin for high-resolution Sr and Ba isotope measurements using thermal ionization mass spectrometry for cosmochemical samples.

scholarly journals Maintaining consistent traceability in high precision isotope measurements of CO<sub>2</sub>: verifying atmospheric trends of δ<sup>13</sup>C

2012 ◽  
Vol 5 (3) ◽  
pp. 4003-4040 ◽  
Author(s):  
L. Huang ◽  
A. Chivulescu ◽  
D. Ernst ◽  
W. Zhang ◽  
Y.-S. Lee
Keyword(s):  
High Precision ◽  
Mean Value ◽  
Rate Of Change ◽  
Atmospheric Co2 ◽  
Precision Measurements ◽  
Total Change ◽  
History Of ◽  
Ambient Measurements ◽  
Isotope Measurements ◽  
Δ13c And Δ18o

Abstract. Maintaining consistent traceability of high precision measurements of CO2 isotopes is critical in being able to observe accurate atmospheric trends of δ13C (CO2). Although a number of laboratories/organizations around the world have been involved in baseline measurements of atmospheric CO2 isotopes for several decades, the reports on their traceability measures are rare. In this paper, a principle and an approach for the traceability maintenance of high precision isotope measurements (δ13C and δ18O) in atmospheric CO2 is described. The uncertainties of the traceability have been estimated based on the history of annual calibrations over the last 10 yr. The overall uncertainties of CO2 isotope measurements for individual ambient samples carried out by our program at Environment Canada are estimated (excluding the uncertainty associated with the sampling). The values are 0.02‰ and 0.05‰ in δ13C and δ18O, respectively, close to the WMO targets for data compatibility. The annual rate of change in δ13C of the primary anchor used in our program (which is the laboratory standard linking ambient measurements back to the primary VPDB scale) is close to zero (−0.0016 ± 0.0012‰ per year) over the period of 10 yr (2001–2011). The average annual decreasing rate of δ13C in air CO2 measurements at Alert over the period from 1999 to 2010 has been confirmed and verified, which is −0.025 ± 0.003‰ per year. The total change of δ13C in the annual mean value during this period is ∼−0.27‰. The concept of "Big Delta" is introduced and its role in maintaining traceability of the isotope measurements is described and discussed extensively. Finally, the challenges and a strategy for maintaining traceability are also discussed and suggested.

scholarly journals Triple Oxygen Isotope Measurements by Multi-Collector Secondary Ion Mass Spectrometry

2021 ◽  
Vol 8 ◽  
Author(s):  
Nordine Bouden ◽  
Johan Villeneuve ◽  
Yves Marrocchi ◽  
Etienne Deloule ◽  
Evelyn Füri ◽  
...  
Keyword(s):  
Mass Spectrometry ◽  
Oxygen Isotope ◽  
Spatial Resolution ◽  
Secondary Ion Mass Spectrometry ◽  
Small Radius ◽  
Large Radius ◽  
Ion Mass Spectrometry ◽  
Secondary Ion ◽  
Isotope Measurements

Secondary ion mass spectrometry (SIMS) is a powerful technique for in situ triple oxygen isotope measurements that has been used for more than 30 years. Since pioneering works performed on small-radius ion microprobes in the mid-80s, tremendous progress has been made in terms of analytical precision, spatial resolution and analysis duration. In this respect, the emergence in the mid-90s of the large-radius ion microprobe equipped with a multi-collector system (MC-SIMS) was a game changer. Further developments achieved on CAMECA MC-SIMS since then (e.g., stability of the electronics, enhanced transmission of secondary ions, automatic centering of the secondary ion beam, enhanced control of the magnetic field, 1012Ω resistor for the Faraday cup amplifiers) allow nowadays to routinely measure oxygen isotopic ratios (18O/16O and 17O/16O) in various matrices with a precision (internal error and reproducibility) better than 0.5‰ (2σ), a spatial resolution smaller than 10 µm and in a few minutes per analysis. This paper focuses on the application of the MC-SIMS technique to the in situ monitoring of mass-independent triple oxygen isotope variations.

Heinrich event 4 and Dansgaard/Oeschger events 5–10 recorded by high-resolution speleothem oxygen isotope data from central China

2014 ◽  
Vol 82 (2) ◽  
pp. 394-404 ◽  
Author(s):  
Houyun Zhou ◽  
Jian-xin Zhao ◽  
Yuexing Feng ◽  
Qiong Chen ◽  
Xiaojian Mi ◽  
...  
Keyword(s):  
High Resolution ◽  
Oxygen Isotope ◽  
High Precision ◽  
High Latitude ◽  
Southwest China ◽  
Asian Summer Monsoon ◽  
Central China ◽  
Temperature Changes ◽  
Heinrich Event ◽  
Asian Summer

AbstractA 50-yr resolution reconstruction of climate and environment variability during the period 43–14 ka was developed using 26 high-precision U/Th dates and 390 oxygen isotope (δ18O) data of a stalagmite (SJ1) collected from Songjia Cave in central China, which is close to the northwestern boundary of the Asian summer monsoon (ASM). The δ18O record in SJ1 displays significant millennial-scale changes that correlate well in timing and duration with Dansgaard/Oeschger (D/O) events 5–10 and Heinrich event 4 (H4) identified in high-latitude regions of the Northern Hemisphere. Four 230Th dates constrain the H4 event precisely to the period of 39.7 to 38.3 ka. Notable centennial variations of the ASM activity could be observed within the H4 event. The magnitude and duration of D/O event 4.1 recorded in SJ1 are similar to those archived in east China but different from those documented in southwest China, suggesting that the manifestation of this event may be regionally different. The timing, duration and structure of D/O events 5–10 and Heinrich event 4 suggest that temperature changes in both hemispheres have exerted significant influences on the ASM variations in central China.

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