Atomic Spectroscopy最新文献_第8页

Three-Dimensional Analyses Of Geological Materials On Nanoscale By Electron Tomography 纳米尺度地质材料的三维电子层析分析

IF 3.4 2区化学

Atomic Spectroscopy Pub Date : 2022-02-17 DOI: 10.46770/as.2022.012

Jianxi Zhu

引用次数: 0

High-Spatial-Resolution Measurement Of Water Content In Olivine Using NanoSIMS 50L 利用NanoSIMS 50L高空间分辨率测量橄榄石中含水量

IF 3.4 2区化学

Atomic Spectroscopy Pub Date : 2022-02-14 DOI: 10.46770/as.2022.005

J. Hao, Wei‐Chieh Yang

{"title":"High-Spatial-Resolution Measurement Of Water Content In Olivine Using NanoSIMS 50L","authors":"J. Hao, Wei‐Chieh Yang","doi":"10.46770/as.2022.005","DOIUrl":"https://doi.org/10.46770/as.2022.005","url":null,"abstract":": Olivine is the most abundant mineral in the planetary mantle. Its water content provides critical constraints on the processes and dynamics of the planetary interior. Olivine usually develops zonings with typical widths of 5–20 μm, which requires high spatial resolution. For secondary ion mass spectrometry (SIMS) measurements, primary beams with low currents were utilized to achieve high spatial resolution. However, this strategy also resulted in high background, which cannot be applied to nominally anhydrous minerals, e.g., olivine. Therefore, achieving high spatial resolution with low background is essential but challenging. For example, even though the NanoSIMS is designed for high-spatial-resolution measurements, the spatial resolution remained at > 10 μm for water content analysis in order to maintain a low water background of < 10 ppm. In this study, we optimized the primary beam settings and raster size for water content analysis of olivine using a CAMECA NanoSIMS 50L to improve the spatial resolution and the background simultaneously. Olivine standard samples (KLB-1, ICH-30, Mongok) with a water content ranging from 11.2 ppm to 70.6 ppm were measured for water content calibration with 1 H - / 16 O - ratio. ppm was used for background monitoring. The results showed that a spatial resolution of ~6 μm (primary beam size + raster size) with a background of 6 ± 2 ppm could be achieved by applying a Cs + beam current of 2 nA with a diameter of ~2 μm, rastering an area of 4 × 4 μm 2 . The analytical reproducibility of this method is better than 13% for standard samples with a water content of > 10 ppm. Overall, this method improved the spatial resolution for measuring water content by a factor of ~2 (in comparison to previous studies) and could be applied to olivine grains with complex zoning.","PeriodicalId":8642,"journal":{"name":"Atomic Spectroscopy","volume":" ","pages":""},"PeriodicalIF":3.4,"publicationDate":"2022-02-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49250524","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

In Situ Micro-XRD Methods For Identifying Glass And Minerals In Extraterrestrial Samples 原位微x射线衍射法鉴别地外样品中的玻璃和矿物

IF 3.4 2区化学

Atomic Spectroscopy Pub Date : 2022-02-14 DOI: 10.46770/as.2022.016

Lingya Ma

{"title":"In Situ Micro-XRD Methods For Identifying Glass And Minerals In Extraterrestrial Samples","authors":"Lingya Ma","doi":"10.46770/as.2022.016","DOIUrl":"https://doi.org/10.46770/as.2022.016","url":null,"abstract":": Glass or amorphous state materials are vital components of lunar regolith and have attracted considerable attention. The analytical data on the texture and structure of glassy and crystallized materials can be used to reconstruct the geological history of the Moon. However, it is often challenging to distinguish glass from crystals based on morphology and elemental composition, especially in complex extraterrestrial samples that have been subjected to significant impact and metamorphism. In this study, micro-X-ray diffraction (µXRD) techniques were used to identify crystalline minerals and glassy phases in lunar breccia samples extracted in the Chang'e-5 mission. The samples were processed using different operating methods to identify a technique that would minimize damage to their original appearance and structure and yield optimal results. The diffraction results, which possessed two-dimensional patterns were classified into dominant dispersion halos, concentric diffraction rings, independent diffraction spots, and coexisting rings and spots. The results correspond to four types of sample states, namely, the amorphous material, polycrystal, single crystal, and a mixture of polycrystals and single crystals. By identifying the crystallization state and phases of various samples in a non-destructive and intuitive manner, µXRD can facilitate in situ analysis of special samples generated during important geological events, thereby promoting the understanding of complex origins and evolution of extraterrestrial bodies.","PeriodicalId":8642,"journal":{"name":"Atomic Spectroscopy","volume":" ","pages":""},"PeriodicalIF":3.4,"publicationDate":"2022-02-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48072824","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

An Improved Method Of Adhesion Force Measurement By Atomic Force Microscopy (AFM) 一种改进的原子力显微镜(AFM)附着力测量方法

IF 3.4 2区化学

Atomic Spectroscopy Pub Date : 2022-02-14 DOI: 10.46770/as.2022.011

Xiongyao Li

{"title":"An Improved Method Of Adhesion Force Measurement By Atomic Force Microscopy (AFM)","authors":"Xiongyao Li","doi":"10.46770/as.2022.011","DOIUrl":"https://doi.org/10.46770/as.2022.011","url":null,"abstract":"The adhesion properties of lunar dust grains are a key to determine its motion state. Atomic force microscopy (AFM) is conducted to evaluate the adhesion properties of such ultrasmall grains. However, effective method to measure the adhesion properties of lunar grains has not yet been developed because of the difficulties in eliminating the effect of adsorption of water and gases on the grain surface. In this study, an improved method was proposed to measure the adhesion force of grains while effectively eliminating the gas molecule adsorption effect. In the proposed method, using a focused ion beam, a small grain was mounted onto the tip of an AFM probe and used to measure the adhesion force of the grain. To determine the effects of environmental pressure and temperature, the adhesion force between a silica ball and a silica wafer was measured under different conditions. Based on the results, the gas molecule adsorption effect can be effectively eliminated during adhesion force measurement through AFM at a temperature of 200 °C and an environmental pressure of <2.4 ×10 Pa, at which strong adhesion of the grain is achieved. The proposed method is suitable for the measurement of adhesion force in lunar grain samples.","PeriodicalId":8642,"journal":{"name":"Atomic Spectroscopy","volume":"455 1","pages":""},"PeriodicalIF":3.4,"publicationDate":"2022-02-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70586946","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Cadmium Isotope Analysis Of Environmental Reference Materials Via Microwave Digestion–Resin Purification–Double-Spike MC-ICP-MS 微波消解-树脂纯化-双峰MC-ICP-MS法分析环境标准物质的镉同位素

IF 3.4 2区化学

Atomic Spectroscopy Pub Date : 2022-02-08 DOI: 10.46770/as.2021.1109

Yongguang Yin, Yong Liang

{"title":"Cadmium Isotope Analysis Of Environmental Reference Materials Via Microwave Digestion–Resin Purification–Double-Spike MC-ICP-MS","authors":"Yongguang Yin, Yong Liang","doi":"10.46770/as.2021.1109","DOIUrl":"https://doi.org/10.46770/as.2021.1109","url":null,"abstract":"Cadmium isotope fractionation is a promising indicator for tracing the source, transport, and transformation of Cd in the environment; therefore, a high-precision method for the Cd isotope analysis of environmental samples is urgently required. In this study, eight environmental reference materials (NIST 2711a, GSS-1, GSS-4, GSS-5, GSD-11, GSD-12, GSD-30, and BCR679) with different matrices were digested under microwave irradiation and purified via anion exchange. Thereafter, their Cd isotope ratios were analyzed using multi-collector inductively coupled plasma mass spectrometry (MC-ICP-MS) with double-spike correction. The samples digested under microwave irradiation exhibited high Cd recovery (> 96%). One step of anion-exchangebased purification can remove most interfering elements without any detectable loss of Cd. If the purified solution contained Zn/Cd > 0.04, Zr/Cd > 0.01, Mo/Cd > 0.2, Pd/Cd > 4 × 10, In/Cd > 0.02, or Sn/Cd > 0.1, a secondary step using the same purification procedure would be necessary. The measured δCd values of reference materials (from −0.558 to 0.550‰) were in adequate agreement with those of previous studies, suggesting that this method can be used to analyze the Cd isotope ratios in soil, sediment, and plant samples. In addition, the large variation in the Cd isotope ratios of these reference materials implies that the Cd isotope ratio is promising for identifying pollution sources and the biogeochemical cycle of Cd.","PeriodicalId":8642,"journal":{"name":"Atomic Spectroscopy","volume":" ","pages":""},"PeriodicalIF":3.4,"publicationDate":"2022-02-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42337027","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

In Situ Rb-Sr Dating Of Lunar Meteorites Using Laser Ablation MC-ICP-MS 月球陨石激光烧蚀MC-ICP-MS原位Rb-Sr测年

IF 3.4 2区化学

Atomic Spectroscopy Pub Date : 2022-01-29 DOI: 10.46770/as.2022.007

Wen Zhang

{"title":"In Situ Rb-Sr Dating Of Lunar Meteorites Using Laser Ablation MC-ICP-MS","authors":"Wen Zhang","doi":"10.46770/as.2022.007","DOIUrl":"https://doi.org/10.46770/as.2022.007","url":null,"abstract":": Plagioclase, pyroxene and glass are the main component phases of different planetary materials. In situ Rb-Sr dating of these common phases thus would represent the timing of magmatic differentiation, effectively complementary to the rare, tiny U-Pb bearing phases that only form at a late stage. In this study, we selected lunar meteorites as examples to establish an i n situ Rb-Sr dating method where plagioclase, pyroxene, ilmenite, and glasses were the laser-ablation (LA) targets. The accuracy of 87 Sr/ 86 Sr and 87 Rb/ 86 Sr measured by LA-MC-ICP-MS was better than 0.2 ‰ and 3 %, respectively, for samples with an 87 Rb/ 86 Sr ratio lower than 1. However, we found that the distributions of Rb and Sr in the natural materials were heterogeneous at the micrometer scale, leading to inaccurate 87 Rb/ 86 Sr ratio correction when calculated by normal data reduction methods. A new data reduction strategy of the smallest unit of isochron age (SUIA) was developed. Using the SUIA, the Rb-Sr isochron age of 2984 ± 43 Ma and 3149 ± 20 Ma was obtained for two lunar meteorites (NWA 10597 and NWA 6950, respectively). These results are identical within 1-2% deviation relative to the U-Pb dating ages for baddeleyite and apatite using SIMS. The present method may have broad applicability for determining the Rb-Sr isochron ages of other planetary samples.","PeriodicalId":8642,"journal":{"name":"Atomic Spectroscopy","volume":" ","pages":""},"PeriodicalIF":3.4,"publicationDate":"2022-01-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48544969","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 5

Reconstructing The Color 3D Tomography Of Lunar Samples 重建月球样品的彩色三维断层扫描

IF 3.4 2区化学

Atomic Spectroscopy Pub Date : 2022-01-29 DOI: 10.46770/as.2022.009

M. Lei

引用次数: 1

Scanning Transmission X-Ray Microscopy At The Canadian Light Source: Progress And Selected Applications In Geosciences 扫描透射x射线显微镜在加拿大光源:进展和选定的应用在地球科学

IF 3.4 2区化学

Atomic Spectroscopy Pub Date : 2022-01-29 DOI: 10.46770/as.2022.008

Jian Wang, Jinhui Li

{"title":"Scanning Transmission X-Ray Microscopy At The Canadian Light Source: Progress And Selected Applications In Geosciences","authors":"Jian Wang, Jinhui Li","doi":"10.46770/as.2022.008","DOIUrl":"https://doi.org/10.46770/as.2022.008","url":null,"abstract":": Synchrotron-based scanning transmission X-ray microscopy (STXM) efficiently integrates X-ray microscopy and X-ray absorption spectroscopy (XAS) to provide quantitative, chemically specific imaging of elements, functional groups, bonding, and oxidation states in 2D and 3D modes at high spatial resolution (sub-10 to 30 nm), high energy resolution, and low radiation doses. STXM has been increasingly used to study various materials and samples for life, earth, planetary, and environmental sciences. In this progress report and minireview, the STXM principle and instrumentation of conventional STXM and the latest STXM-ptychography at the Canadian Light Source are first discussed. Then, two representative applications of STXM on geoscience-related samples, including magnetotactic bacteria, soil microaggregates, and related systems, are presented to illustrate the strong capabilities and suitability of STXM to elucidate complex systems, processes, and associations in the natural sciences. Finally, the potential applications and prospects of the STXM-related techniques in characterizing precious extraterrestrial samples ( e.g. , lunar samples returned by China’s Chang’e-5 mission) are briefly discussed.","PeriodicalId":8642,"journal":{"name":"Atomic Spectroscopy","volume":" ","pages":""},"PeriodicalIF":3.4,"publicationDate":"2022-01-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44922256","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 4

Atomic Spectroscopy 原子光谱法

IF 3.4 2区化学

Atomic Spectroscopy Pub Date : 2022-01-29 DOI: 10.46770/as.2022.006

Xiaohua Xia

引用次数: 0

In Situ Investigation Of The Valence States Of Iron-Bearing Phases In Chang’E-5 Lunar Soil Using FIB, AES, And TEM-EELS Techniques 利用FIB、AES和TEM-EELS技术原位研究嫦娥五号月球土壤中含铁相的价态

IF 3.4 2区化学

Atomic Spectroscopy Pub Date : 2022-01-29 DOI: 10.46770/as.2022.002

Yang Li

{"title":"In Situ Investigation Of The Valence States Of Iron-Bearing Phases In Chang’E-5 Lunar Soil Using FIB, AES, And TEM-EELS Techniques","authors":"Yang Li","doi":"10.46770/as.2022.002","DOIUrl":"https://doi.org/10.46770/as.2022.002","url":null,"abstract":": Nanophase iron (np-Fe 0 ) is a major product of space weathering and its presence significantly alters the reflectance spectral characteristics of lunar soil. Previous studies have established that the np-Fe 0 particles originate from the reduction of ferrous ions in the plasma, in-situ decomposition of olivine and pyroxene, and disproportionation of ferrous ions in solid ferrosilicates. In this study, sample charging effects were eliminated and in situ nanoscale valence state analysis of iron-bearing phases in Chang’E-5 lunar soil was conducted by combining focused ion beam (FIB) microscopy, Auger electron spectroscopy (AES), and transmission electron microscopy-electron energy loss spectroscopy (TEM-EELS) techniques. The results indicate that the contents and valence states of iron in the np-Fe 0 particles, amorphous matrix, and ferrosilicates differ. The np-Fe 0 particles were found to be composed of pure metallic iron, whereas ferrous and ferric iron ions were present in olivine crystals and the amorphous matrix, respectively. The discovery of both metallic and ferric iron in the amorphous matrix of Chang’E-5 lunar soil offers new insights regarding the disproportionation reaction of Fe 2+ on the lunar surface. This study demonstrates that the combination of FIB, AES, and TEM-EELS is an effective and precise approach for analyzing the valence states of iron-bearing phases in lunar soil, which can be extended to other extraterrestrial samples and other multivalent elements.","PeriodicalId":8642,"journal":{"name":"Atomic Spectroscopy","volume":" ","pages":""},"PeriodicalIF":3.4,"publicationDate":"2022-01-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48620449","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 8