Nano‐FTIR Investigation of the CM Chondrite Allan Hills 83100

Young, Jesse W.; Glotch, T. D.; Yeşiltaş, Mehmet; Hamilton, V. E.; Breitenfeld, L. B.; Bechtel, Hans A.; Corder, Stephanie N. Gilbert; Yao, Ziheng

doi:10.1029/2021je007166

Cited by 5 publications

(3 citation statements)

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“…Novel analytical techniques with nanoscale spatial resolution are clearly required to detect and characterize this organic matter within extraterrestrial astromaterials, such as returned samples from asteroids and other planetary bodies. Scattering‐type near‐field optical microscopy (s‐SNOM)‐based nanoscale Fourier transform infrared (nano‐FTIR) spectroscopy is a robust and useful technique providing exceptional spatial resolution down to 5 nm (Mastel et al., 2018) and detection capabilities without the optical limitations of conventional IR spectroscopy (Amarie et al., 2012; Huth et al., 2012; Yesiltas, Glotch, & Kaya, 2021; Yesiltas, Glotch, & Sava, 2021; Young et al., 2022). By utilizing an apertureless near‐field optical microscope, both the essential information and the background signals arising from sources like the AFM tip shaft and far‐field emissions from the sample under examination are captured.…”

Section: Introductionmentioning

confidence: 99%

Nanoscale Spectroscopic Identification and Characterization of Minerals and Organic Matter in Ryugu Particles

Yesiltas,

Glotch,

Kebukawa

et al. 2024

JGR Planets

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Carbonaceous asteroids are leftover materials from the early solar system. They did not undergo planetary differentiation processes and thus still retained signatures and clues of the origin and evolution of the solar system. Thus, samples of carbonaceous asteroids provide significant potential for deciphering the origin of the solar system. The Hayabusa2 spacecraft returned the first samples of a carbonaceous asteroid (162173) Ryugu. In this work, we report the nanoscale mineralogy and organic matter content of two Ryugu particles, A0030 and C0034. These were analyzed by highly novel scattering‐type scanning near‐field optical microscopy (s‐SNOM)‐based nanoscale‐Fourier transform infrared (nano‐FTIR) spectroscopy with ∼20 nm spatial resolution. The nano‐FTIR measurements were supported by confocal micro‐Raman imaging and spectroscopy (∼500 nm/pixel spatial sampling). Our investigations show that the two Ryugu particles (a) contain different silicate mineralogies, indicating heterogeneous and incomplete aqueous alteration and (b) are highly rich in organic matter, consisting a variety of molecular functional groups. The spatial distributions of chemical functional groups and their associations based on pseudo‐heterodyne (PsHet) SNOM imaging show that the organic matter is distributed as either diffused or discrete grains. Micro‐Raman spectra show that the Ryugu particles experienced minimal thermal metamorphism, although A0030 was slightly more heated than C0034. The identification of abundant nanoscale organic molecules within the Ryugu grains that could not be identified via micrometer‐scale investigations emphasizes the importance of using nanoscale nondestructive methods for studying primitive solar system materials, such as Ryugu and OSIRIS‐Rex particles and those that will be returned in the future (such as MMX samples).

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Section: Introductionmentioning

confidence: 99%

Nanoscale Spectroscopic Identification and Characterization of Minerals and Organic Matter in Ryugu Particles

Yesiltas,

Glotch,

Kebukawa

et al. 2024

JGR Planets

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“…Over the nearly five decades since the Apollo landings, technological advances have extended laboratory investigations with nanometer spatial resolution using techniques such as atom probe tomography/desorption and nano-secondary ion mass spectroscopy (NanoSIMS) [15]. Though optical spectroscopy techniques can now also be carried out with nanoscale spatial resolution [16,17,18,19], most spatially resolved studies are restricted by a diffraction-limited spectral resolution, mostly in the mid-IR [20,2,11,14]. Typically, these optical measurements focus on the Christiansen feature (CF) and Reststrahlen bands (RB) which appear in the ~ 650 to 4000 cm -1 (2.5 to 15 μm) region.…”

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confidence: 99%

Nanoscale Characterization of Space Weathered Lunar Samples

Orlando,

Grice,

Stancil

et al. 2024

Preprint

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High-resolution nanoscale Fourier transform infrared (Nano-FTIR) imaging and spectroscopy correlated with photoluminescence measurements of a lunar ilmenite basalt (12016) and recrystallized impact melt breccia (15445), Apollo samples with different origins and history, reveal distinct chemical differences associated with the parent-rock geochemistry and space weathering effects. Intrinsic or delivered Nd3+ and an amorphous silicate glass component produced by solar wind bombardment are observed on exterior surfaces, whereas intrinsic Cr3+ and/or trapped electron states likely produced by energetic x-rays or cosmic rays are observed in interior surfaces. Spatially localized 1050 cm-1/935 cm-1 band ratios in Nano-FTIR hyperspectral maps may reflect shock-induced nanostructures in the impact melt brecci, while shifts in silicate band positions may indicate general space-weathering. Collectively, the shock features, amorphous silicate over-layer, electron-trap states and differential Nd3+ and Cr3+ ratios provide compelling evidence and proxies for space weathering and transformation events not easily obtained with conventional far-field optical analysis techniques.

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“…Most of those studies are for bulk and powdered rock or mineral samples (e.g., Bramble et al, 2019;Cooper et al, 2002;Donaldson Hanna et al, 2012;Hamilton, 2010;Salisbury & Walter, 1989;Salisbury et al, 1987Salisbury et al, , 1991Shirley & Glotch, 2019;Yang et al, 2017). For the precious extraterrestrial samples, it is usually difficult to separate out enough pure endmembers for spectral analysis, and thus micro MIR spectroscopy becomes a better choice (Hecker et al, 2010;Young et al, 2022). As demonstrated by Zeng et al (2019), micro-FTIR (Fourier-transform infrared) technique can be used as a new diagnostic tool to discern the origin of lunar glasses (i.e., pyroclastic, highland impact, or mare impact glasses).…”

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confidence: 99%

A Micro Mid‐Infrared Spectroscopic Study of Chang’e‐5 Sample

et al. 2022

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The Chang’e‐5 (CE‐5) mission has successfully returned samples from a site that is much younger than the sites of all previous lunar sampling missions. Sample analysis results reported so far have revealed a more complex sampling area than previously thought, casting uncertainties over the interpretation of remote sensing spectral data and the U and Th abundance derived from the orbital data. Laboratory spectral measurement of the returned samples can serve as validation of remote sensing observations and thus help refine our understanding of the geological evolution of the landing region. In this study we report detailed micro mid‐infrared (MIR) spectral characteristics of individual soil grains of CE‐5 samples. The spectral analysis results show that the CE‐5 olivine grains have low Fo (molar Mg/[Mg + Fe] × 100) consistent with previous studies, indicating a Fe‐rich source region of the mantle or a highly evolved magma. These olivine grains show high level of crystallinity, implying low degree of space weathering. Most of the CE‐5 glasses analyzed are spectrally consistent with mare impact glasses, despite that a few of them may have a volcanic origin. These laboratory spectral analysis of CE‐5 samples in the MIR wavelengths at a micro scale, together with the derived MIR optical constants of the olivine, pyroxene, plagioclase, and glass grains, provide important input for the modeling and interpretation of thermal remote sensing data of the Moon.

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Nano‐FTIR Investigation of the CM Chondrite Allan Hills 83100

Abstract: Mid-infrared (MIR) spectroscopy has been used to great success toward quantitatively determining the mineralogy of geologic samples (

Cited by 5 publications

References 88 publications

Nanoscale Spectroscopic Identification and Characterization of Minerals and Organic Matter in Ryugu Particles

Nanoscale Spectroscopic Identification and Characterization of Minerals and Organic Matter in Ryugu Particles

Nanoscale Characterization of Space Weathered Lunar Samples

A Micro Mid‐Infrared Spectroscopic Study of Chang’e‐5 Sample

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