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OSIRIS-REx Contamination Control Strategy and Implementation (2017)

Clark, B. C. ; Beshore, E. ; Aponte, J. C. ; [weitere]

In: CASI

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Publikationsdatum: 2019-08-13

Beschreibung: OSIRIS-REx will return pristine samples of carbonaceous asteroid Bennu. This manuscript describes how pristine was defined based on expectations of Bennu and on a realistic understanding of what is achievable with a constrained schedule and budget, and how that definition flowed to requirements and implementation. To return a pristine sample, the OSIRIS-REx spacecraft sampling hardware was maintained at Level 100 A/2 and less than 180 nanograms per square centimeter of amino acids and hydrazine on the sampler head through precision cleaning, control of materials, and vigilance. Contamination is further characterized via witness material exposed to the spacecraft assembly and testing environment as well as in space. This characterization provided knowledge of the expected background and will be used in conjunction with archived spacecraft components for comparison with the samples when they are delivered to Earth for analysis. Most of all, the cleanliness of the OSIRIS-REx spacecraft was achieved through communication between scientists, engineers, managers, and technicians.

Schlagwort(e): Lunar and Planetary Science and Exploration

Materialart: GSFC-E-DAA-TN41800 , International Conference on the Origin of Life; Jul 16, 2018 - Jul 21, 2018; San Diego, CA; United States

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OSIRIS-REx Contamination Control Strategy and Implementation (2017)

Connolly, H. C., Jr. ; Righter, K. ; Everett, D. F. ; [weitere]

In: Other Sources

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Publikationsdatum: 2019-08-26

Beschreibung: OSIRIS-REx will return pristine samples of carbonaceous asteroid Bennu. This article describes how pristine was defined based on expectations of Bennu and on a realistic understanding of what is achievable with a constrained schedule and budget, and how that definition flowed to requirements and implementation. To return a pristine sample, the OSIRIS-REx spacecraft sampling hardware was maintained at level 100 A/2 and less than 180 ng/cm(exp 2) of amino acids and hydrazine on the sampler head through precision cleaning, control of materials, and vigilance. Contamination is further characterized via witness material exposed to the spacecraft assembly and testing environment as well as in space. This characterization provided knowledge of the expected background and will be used in conjunction with archived spacecraft components for comparison with the samples when they are delivered to Earth for analysis. Most of all, the cleanliness of the OSIRIS-REx spacecraft was achieved through communication among scientists, engineers, managers, and technicians.

Schlagwort(e): Lunar and Planetary Science and Exploration

Materialart: GSFC-E-DAA-TN50790 , Space Science Review (ISSN 0038-6308) (e-ISSN 1572-9672); 214; 1; 19

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Topological surface state of $α−\mathrm{Sn}$ on InSb(001) as studied by photoemission (2018)

M. R. Scholz, V. A. Rogalev, L. Dudy, F. Reis, F. Adler, J. Aulbach, L. J. Collins-Mc; Intyre, L. B. Duffy, H. F. Yang, Y. L. Chen, T. Hesjedal, Z. K. Liu, M. Hoesch, S. Muff, J. H. Dil, J. Schäfer, and R. Claessen

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2018-02-02

Beschreibung: Author(s): M. R. Scholz, V. A. Rogalev, L. Dudy, F. Reis, F. Adler, J. Aulbach, L. J. Collins-McIntyre, L. B. Duffy, H. F. Yang, Y. L. Chen, T. Hesjedal, Z. K. Liu, M. Hoesch, S. Muff, J. H. Dil, J. Schäfer, and R. Claessen We report on the electronic structure of the elemental topological semimetal α − Sn on InSb(001). High-resolution angle-resolved photoemission data allow us to observe the topological surface state (TSS) that is degenerate with the bulk band structure and show that the former is unaffected by differen... [Phys. Rev. B 97, 075101] Published Thu Feb 01, 2018

Schlagwort(e): Electronic structure and strongly correlated systems

Print ISSN: 1098-0121

Digitale ISSN: 1095-3795

Thema: Physik

Publiziert von American Physical Society (APS)

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Spectral Characterization of Analog Samples in Anticipation of OSIRIS-REx's Arrival at Bennu (2017)

Donaldson Hanna, K. L. ; Clark, B. E. ; Hamilton, V. E. ; [weitere]

In: CASI

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Publikationsdatum: 2019-07-13

Beschreibung: NASA's Origins, Spectral Interpretation, Resource Identification, and Security-Regolith Explorer (OSIRIS-REx) mission successfully launched on September 8th, 2016. During its rendezvous with near-Earth asteroid (101955) Bennu beginning in 2018, OSIRIS-REx will characterize the asteroid's physical, mineralogical, and chemical properties in an effort to globally map the properties of Bennu, a primitive carbonaceous asteroid, and choose a sampling location [e.g. 1]. In preparation for these observations, we spectrally characterized a suite of analog samples across visible, near- and thermal-infrared wavelengths and used these in initial tests of phase detection and abundance determination software algorithms. Here we present the thermal infrared laboratory measurements of the analog sample suite measured under asteroidlike conditions, which are relevant to the interpretation of spectroscopic observations by the OSIRIS-REx Thermal Emission Spectrometer (OTES) [2, 3]. This suite of laboratory measurements of asteroid analogs under asteroid-like conditions is the first of their kind.

Schlagwort(e): Lunar and Planetary Science and Exploration

Materialart: JSC-CN-38849 , Lunar and Planetary Science Conference; Mar 20, 2017 - Mar 24, 2017; The Woodlands, TX; United States

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Revealing the hidden order in ${\mathrm{BaTi}}_{2}{\mathrm{As}}_{2}\mathrm{O}$ via nuclear magnetic resonance (2018)

D. W. Song, J. Li, D. Zhao, L. K. Ma, L. X. Zheng, S. J. Li, L. P. Nie, X. G. Luo, Z. P. Yin, T. Wu, and X. H. Chen

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2018-12-21

Beschreibung: Author(s): D. W. Song, J. Li, D. Zhao, L. K. Ma, L. X. Zheng, S. J. Li, L. P. Nie, X. G. Luo, Z. P. Yin, T. Wu, and X. H. Chen In low-dimensional metallic systems, lattice distortion is usually coupled to a density-wave-like electronic instability due to Fermi-surface nesting (FSN) and strong electron-phonon coupling [M. D. Johannes and I. I. Mazin, Phys. Rev. B 77 , 165135 (2008) ]. However, the ordering of other electronic ... [Phys. Rev. B 98, 235142] Published Thu Dec 20, 2018

Schlagwort(e): Electronic structure and strongly correlated systems

Print ISSN: 1098-0121

Digitale ISSN: 1095-3795

Thema: Physik

Publiziert von American Physical Society (APS)

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Single-crystal growth and physical property characterization of the intermediate-valence compound YbFe_{2} Al_{10} (2017)

J. L. Lv, R. Y. Chen, H. P. Wang, J. L. Luo, and N. L. Wang

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2017-06-17

Beschreibung: Author(s): J. L. Lv, R. Y. Chen, H. P. Wang, J. L. Luo, and N. L. Wang We report single-crystal growth and physical property characterization of YbFe 2 Al 10 compounds. The measurements of resistivity, magnetic susceptibility, and specific heat show different behaviors from previous studies on polycrystalline samples. An intermediate-valence characteristic with moderate m… [Phys. Rev. B 95, 235132] Published Fri Jun 16, 2017

Schlagwort(e): Electronic structure and strongly correlated systems

Print ISSN: 1098-0121

Digitale ISSN: 1095-3795

Thema: Physik

Publiziert von American Physical Society (APS)

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Evidence of topological insulator state in the semimetal LaBi (2017)

R. Lou, B.-B. Fu, Q. N. Xu, P.-J. Guo, L.-Y. Kong, L.-K. Zeng, J.-Z. Ma, P. Richard, C. Fang, Y.-B. Huang, S.-S. Sun, Q. Wang, L. Wang, Y.-G. Shi, H. C. Lei, K. Liu, H. M. Weng, T. Qian, H. Ding, and S.-C. Wang

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2017-03-25

Beschreibung: Author(s): R. Lou, B.-B. Fu, Q. N. Xu, P.-J. Guo, L.-Y. Kong, L.-K. Zeng, J.-Z. Ma, P. Richard, C. Fang, Y.-B. Huang, S.-S. Sun, Q. Wang, L. Wang, Y.-G. Shi, H. C. Lei, K. Liu, H. M. Weng, T. Qian, H. Ding, and S.-C. Wang By employing angle-resolved photoemission spectroscopy combined with first-principles calculations, we performed a systematic investigation on the electronic structure of LaBi, which exhibits extremely large magnetoresistance (XMR), and is theoretically predicted to possess band anticrossing with no… [Phys. Rev. B 95, 115140] Published Thu Mar 23, 2017

Schlagwort(e): Electronic structure and strongly correlated systems

Print ISSN: 1098-0121

Digitale ISSN: 1095-3795

Thema: Physik

Publiziert von American Physical Society (APS)

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Dirac line nodes and effect of spin-orbit coupling in the nonsymmorphic critical semimetals MSiS(M=Hf,Zr) (2017)

C. Chen, X. Xu, J. Jiang, S.-C. Wu, Y. P. Qi, L. X. Yang, M. X. Wang, Y. Sun, N. B. M. Schröter, H. F. Yang, L. M. Schoop, Y. Y. Lv, J. Zhou, Y. B. Chen, S. H. Yao, M. H. Lu, Y. F. Chen, C. Felser, B. H. Yan, Z. K. Liu, and Y. L. Chen

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2017-03-23

Beschreibung: Author(s): C. Chen, X. Xu, J. Jiang, S.-C. Wu, Y. P. Qi, L. X. Yang, M. X. Wang, Y. Sun, N. B. M. Schröter, H. F. Yang, L. M. Schoop, Y. Y. Lv, J. Zhou, Y. B. Chen, S. H. Yao, M. H. Lu, Y. F. Chen, C. Felser, B. H. Yan, Z. K. Liu, and Y. L. Chen Topological Dirac semimetals (TDSs) represent a new state of quantum matter recently discovered that offers a platform for realizing many exotic physical phenomena. A TDS is characterized by the linear touching of bulk (conduction and valance) bands at discrete points in the momentum space [i.e., th… [Phys. Rev. B 95, 125126] Published Wed Mar 22, 2017

Schlagwort(e): Electronic structure and strongly correlated systems

Print ISSN: 1098-0121

Digitale ISSN: 1095-3795

Thema: Physik

Publiziert von American Physical Society (APS)

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High-Resolution, Ground-Based Observations of the Lunar Sodium Exosphere During the Lunar Atmosphere and Dust Environment Explorer (LADEE) Mission (2018)

Spalsbury, L. C. ; Sarantos, Menelaos ; Gardner, D. D. ; [weitere]

In: Other Sources

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Publikationsdatum: 2019-07-13

Beschreibung: We present the first comprehensive set of lunar exospheric line width and line width derived effective temperatures as a function of lunar phase (66 waxing phase to 79 waning phase). Data were collected between November 2013 and May 2014 during six observing runs at the National Solar Observatory McMath-Pierce Solar Telescope by applying high-resolution Fabry-Perot spectroscopy (R ~ 180,000) to observe emission from exospheric sodium (5,889.9509 , D2 line). The 3-arc min field of view of the instrument, corresponding to ~336 km at the mean lunar distance (384,400 km), was positioned at several locations off the lunar limb; only equatorial observations taken out to 950 km are presented here. We find the sodium effective temperature distribution to be approximately a symmetric function of lunar phase with respect to full Moon. Within magnetotail passage we find temperatures in the range of 2500-9000 K. For phase angles greater than 40deg we find that temperatures flatten out to ~1700 K.

Schlagwort(e): Lunar and Planetary Science and Exploration

Materialart: GSFC-E-DAA-TN61679 , Journal of Geophysical Research: Planets (ISSN 2169-9097) (e-ISSN 2169-9100); 123; 9; 2430-2444

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Characterizing Nanophase Materials on Mars: Spectroscopic Studies of Allophane and Imogolite (2018)

Jeute, T. J. ; Bishop, J. L. ; Rampe, E. B. ; [weitere]

In: CASI

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Publikationsdatum: 2019-07-13

Beschreibung: The presence of allophane and other nanophase materials on Mars indicates a time when water was intermittent and short lived. These materials likely represent partially altered or leached basaltic ash and therefore, could represent a geologic marker for where water was present on the Martian surface. Further, they may indicate regions of climate change, where surface water was not present long enough to form clays. Characterization of these materials is important for increasing spectral recognition capacities of our current Martian science array. Ongoing work suggests that variability in the Al:Si ratio of allophane can dictate the amount of both structural and adsorbed water in the crystalline structure.

Schlagwort(e): Lunar and Planetary Science and Exploration

Materialart: LPI Contrib. No. 2083-2137 , JSC-E-DAA-TN54276 , Lunar and Planetary Science Conference (LPSC); Mar 19, 2018 - Mar 23, 2018; Woodlands, TX; United States

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