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33 results on '"Rodionov, D. S."'

3. Dust Complex for Studying the Dust Particle Dynamics in the Near-Surface Atmosphere of Mars

Author

Zakharov, A. V., Dolnikov, G. G., Kuznetsov, I. A., Lyash, A. N., Esposito, F., Molfese, C., Rodríguez, I. Arruego, Seran, E., Godefroy, M., Dubov, A. E., Dokuchaev, I. V., Knyazev, M. G., Bondarenko, A. V., Gotlib, V. M., Karedin, V. N., Shashkova, I. A., Abdelaal, M. E., Kartasheva, A. A., Shekhovtsova, A. V., Bednyakov, S. A., Barke, V. V., Yakovlev, A. V., Grushin, V. A., Bychkova, A. S., Popel, S. I., Korablev, O. I., Rodionov, D. S., Duxbury, N. S., Petrov, O. F., Lisin, E. A., Vasiliev, M. M., Poroikov, A. Yu., Borisov, N. D., Cortecchia, F., Saggin, B., Cozzolino, F., Brienza, D., Scaccabarozzi, D., Mongelluzzo, G., Franzese, G., Porto, C., Rico, A. Martín Ortega, Santiuste, N. Andrés, de Mingo, J. R., Popa, C. I., Silvestro, S., and Brucato, J. R.

Published
2022
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10. LIDAR for Investigation of the Martian Atmosphere from the Surface

Author

Lipatov, A. N., primary, Lyash, A. N., additional, Ekonomov, A. P., additional, Makarov, V. S., additional, Lesnykh, V. A., additional, Goretov, V. A., additional, Zakharkin, G. V., additional, Khlyustova, L. I., additional, Antonenko, S. A., additional, Rodionov, D. S., additional, and Korablev, O. I., additional

Published
2023
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14. The Incredible Diversity of Fe-bearing Phases at Gusev Crater, Mars, According to the Mars Exploration Rover Moessbauer Spectrometer

Author

Morris, R. V, Klingelhoefer, G, Schroeder, C, Rodionov, D. S, Ming, D. W, and Yen, A

Subjects
Lunar And Planetary Science And Exploration
Abstract

The Mars Exploration Rover (MER) Spirit landed on the plains of Gusev Crater on 4 January 2004. One primary scientific objective for the mission is to characterize the mineralogical and elemental composition of surface materials, searching for evidence of water and clues for assessing past and current climates and their suitability for life [1]. The role of the Moessbauer (MB) spectrometer on Spirit is to provide quantitative information about the distribution of Fe among its oxidation and coordination states, identification of Fe-bearing phases, and relative distribution of Fe among those phases. The speciation and distribution of Fe in Martian rock and soil constrains the primary rock types, redox conditions under which primary minerals crystallized, the extent of alteration and weathering, the type of alteration and weathering products, and the processes and environmental conditions for alteration and weathering. In this abstract, we discuss the incredible diversity of Fe-bearing phases detected by Spirit s MB instrument during its first 540 sols of exploration at Gusev crater [2,3].

Published
2006

15. Moessbauer Mineralogy of Rock, Soil, and Dust at Gusev Crater, Mars: Spirit's Journey through Weakly Altered Olivine Basalt on the Plains and Pervasively Altered Basalt in the Columbia Hills

Author

Morris, R. V, Klingelhoefer, G, Schroeder, C, Rodionov, D. S, Yen, A, Ming, D. W, deSouza, P. A., Jr, Fleischer, I, Wdowiak, T, Gellert, R, Bernhardt, B, Evlanov, E. N, Zubkov, B, Foh, J, Bonnes, U, Kankeleit, E, Guetlich, P, Renz, F, Squyres, S. W, and Arvidson, R. E

Subjects
Geophysics
Abstract

The Moessbauer spectrometer on Spirit measured the oxidation state of Fe, identified Fe-bearing phases, and measured relative abundances of Fe among those phases for surface materials on the plains and in the Columbia Hills of Gusev crater. Eight Fe-bearing phases were identified: olivine, pyroxene, ilmenite, magnetite, nanophase ferric oxide (npOx), hematite, goethite, and a Fe(3+)-sulfate. Adirondack basaltic rocks on the plains are nearly unaltered (Fe(3+)/Fe(sub T)<0.2) with Fe from olivine, pyroxene (Ol>Px), and minor npOx and magnetite. Columbia Hills basaltic rocks are nearly unaltered (Peace and Backstay), moderately altered (WoolyPatch, Wishstone, and Keystone), and pervasively altered (e.g., Clovis, Uchben, Watchtower, Keel, and Paros with Fe(3+)/Fe(sub T) approx.0.6-0.9). Fe from pyroxene is greater than Fe from olivine (Ol sometimes absent), and Fe(2+) from Ol+Px is 40-49% and 9-24% for moderately and pervasively altered materials, respectively. Ilmenite (Fe from Ilm approx.3-6%) is present in Backstay, Wishstone, Keystone, and related rocks along with magnetite (Fe from Mt approx. 10-15%). Remaining Fe is present as npOx, hematite, and goethite in variable proportions. Clovis has the highest goethite content (Fe from Gt=40%). Goethite (alpha-FeOOH) is mineralogical evidence for aqueous processes because it has structural hydroxide and is formed under aqueous conditions. Relatively unaltered basaltic soils (Fe(3+)/Fe(sub T) approx. 0.3) occur throughout Gusev crater (approx. 60-80% Fe from Ol+Px, approx. 10-30% from npOx, and approx. 10% from Mt). PasoRobles soil in the Columbia Hills has a unique occurrence of high concentrations of Fe(3+)-sulfate (approx. 65% of Fe). Magnetite is identified as a strongly magnetic phase in Martian soil and dust.

Published
2006

16. Weathering of Basaltic Rocks from the Gusev Plains up into the Columbia Hills from the Perspective of the MER Mossbauer Spectrometer

Author

Schroeder, C, Klingelhoefer, G, Morris, R. V, Rodionov, D. S, deSouza, P. A, Ming, D. W, Yen, A. S, Gellert, R, and Bell, J. F., III

Subjects
Geophysics
Abstract

Rocks on the ejecta blanket of Bonneville crater and along Spirit s traverse over the Gusev plains towards the Columbia Hills are angular and strewn across the surface. They have a basaltic composition [1,2], and their Mossbauer spectra are dominated by an olivine doublet [1]. The ubiquitous presence of abundant olivine in rocks and in surrounding soil suggests that physical rather than chemical weathering processes currently dominate the plains at Gusev crater [1]. However, MB spectra of rocks and outcrops in the Columbia Hills suggest more aggressive alteration processes have occurred. Ascending into the hills, Spirit encountered outcrop and rocks exhibiting layered structures. Some scattered rocks at the foot of the Columbia Hills appeared "rotten" or highly altered by physical and/or chemical processes (fig. 1). Mossbauer spectra of those rocks show a decrease in olivine accompanied by an increase in the Fe-oxides magnetite, hematite, and nanophase Fe3+ -oxides (fig. 2), suggesting that chemical weathering processes in the presence of water have altered these rocks and outcrops.

Published
2005

17. MIMOS II on MER One Year of Mossbauer Spectroscopy on the Surface of Mars: From Jarosite at Meridiani Planum to Goethite at Gusev Crater

Author

Klingelhoefer, G, Rodionov, D. S, Morris, R. V, Schroeder, C, deSouza, P. A, Ming, D. W, Yen, A. S, Bernhardt, B, Renz, F, and Fleischer, I

Subjects
Lunar And Planetary Science And Exploration
Abstract

The miniaturized Mossbauer (MB) spectrometer MIMOS II [1] is part of the Athena payload of NASA s twin Mars Exploration Rovers "Spirit" (MER-A) and "Opportunity" (MER-B). It determines the Fe-bearing mineralogy of Martian soils and rocks at the Rovers respective landing sites, Gusev crater and Meridiani Planum. Both spectrometers performed successfully during first year of operation. Total integration time is about 49 days for MERA (79 samples) and 34 days for MER-B (85 samples). For curiosity it might be interesting to mention that the total odometry of the oscillating part of the MB drive exceeds 35 km for both rovers.

Published
2005

19. Quantum chemistry and nuclear dynamics as diagnostic tools for stellar atmosphere modeling

Author

Guitou, M., Spielfiedel, A., Rodionov, D. S., Yakovleva, S. A., Belyaev, A.K., Merle, Thibault, Thévenin, Frédéric, Feautrier, N., Guitou, M., Spielfiedel, A., Rodionov, D. S., Yakovleva, S. A., Belyaev, A.K., Merle, Thibault, Thévenin, Frédéric, and Feautrier, N.

Abstract

SCOPUS: ar.j, info:eu-repo/semantics/published

Published
2015

22. Cross sections for low-energy inelastic Mg + H and Mg+ + H- collisions

Author

Belyaev, Andrey K., Barklem, Paul, Spielfiedel, A., Guitou, M., Feautrier, N., Rodionov, D. S., Vlasov, D. V., Belyaev, Andrey K., Barklem, Paul, Spielfiedel, A., Guitou, M., Feautrier, N., Rodionov, D. S., and Vlasov, D. V.

Abstract

We report full quantum scattering calculations for low-energy near-threshold inelastic cross sections in Mg + H and Mg+ + H- collisions. The calculations include all transitions between the eight lowest adiabatic MgH((2)Sigma(+)) molecular states, with the uppermost of those diabatically extended to the ionic molecular state in the asymptotic region. This allows us to treat the excitation processes between the seven lowest atomic states of magnesium in collisions with hydrogen atoms, as well as the ion-pair production and the mutual neutralization processes. The collision energy range is from threshold up to 10 eV. These results are important for astrophysical modeling of spectra in stellar atmospheres. The processes in question are carefully examined and several process mechanisms are found. Some mechanisms are determined by interactions between ionic and covalent configurations at relatively large internuclear distances, while others are based on short-range nonadiabatic regions due to interactions between covalent configurations.

Published
2012
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23. Ab initio cross sections for low-energy inelastic Mg+H collisions

Author

Belyaev, Andrey K., Barklem, Paul S., Guitou, M., Spielfiedel, A., Feautrier, N., Vlasov, D. V., Rodionov, D. S., Belyaev, Andrey K., Barklem, Paul S., Guitou, M., Spielfiedel, A., Feautrier, N., Vlasov, D. V., and Rodionov, D. S.

Abstract

Full quantum scattering calculations of cross sections for low-energy near-threshold inelastic Mg + H collisions are reported, such processes being of interest for modelling of Mg spectral lines in stellar atmospheres. Nonadiabatic transions associated with radial couplings at avoided ionic crossings in the 2Σ+ molecular states are found to be the main mechanism for excitation and ion-pair production processes.

Published
2012
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26. Iron mineralogy and aqueous alteration from Husband Hill through Home Plate at Gusev Crater, Mars: Results from the Mössbauer instrument on the Spirit Mars Exploration Rover

Author

Morris, R. V., primary, Klingelhöfer, G., additional, Schröder, C., additional, Fleischer, I., additional, Ming, D. W., additional, Yen, A. S., additional, Gellert, R., additional, Arvidson, R. E., additional, Rodionov, D. S., additional, Crumpler, L. S., additional, Clark, B. C., additional, Cohen, B. A., additional, McCoy, T. J., additional, Mittlefehldt, D. W., additional, Schmidt, M. E., additional, de Souza, P. A., additional, and Squyres, S. W., additional

Published
2008
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27. Meteorites on Mars observed with the Mars Exploration Rovers

Author

Schröder, C., primary, Rodionov, D. S., additional, McCoy, T. J., additional, Jolliff, B. L., additional, Gellert, R., additional, Nittler, L. R., additional, Farrand, W. H., additional, Johnson, J. R., additional, Ruff, S. W., additional, Ashley, J. W., additional, Mittlefehldt, D. W., additional, Herkenhoff, K. E., additional, Fleischer, I., additional, Haldemann, A. F. C., additional, Klingelhöfer, G., additional, Ming, D. W., additional, Morris, R. V., additional, de Souza, P. A., additional, Squyres, S. W., additional, Weitz, C., additional, Yen, A. S., additional, Zipfel, J., additional, and Economou, T., additional

Published
2008
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28. Mössbauer mineralogy of rock, soil, and dust at Meridiani Planum, Mars: Opportunity's journey across sulfate-rich outcrop, basaltic sand and dust, and hematite lag deposits

Author

Morris, R. V., primary, Klingelhöfer, G., additional, Schröder, C., additional, Rodionov, D. S., additional, Yen, A., additional, Ming, D. W., additional, de Souza, P. A., additional, Wdowiak, T., additional, Fleischer, I., additional, Gellert, R., additional, Bernhardt, B., additional, Bonnes, U., additional, Cohen, B. A., additional, Evlanov, E. N., additional, Foh, J., additional, Gütlich, P., additional, Kankeleit, E., additional, McCoy, T., additional, Mittlefehldt, D. W., additional, Renz, F., additional, Schmidt, M. E., additional, Zubkov, B., additional, Squyres, S. W., additional, and Arvidson, R. E., additional

Published
2006
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29. Mössbauer mineralogy of rock, soil, and dust at Gusev crater, Mars: Spirit's journey through weakly altered olivine basalt on the plains and pervasively altered basalt in the Columbia Hills

Author

Morris, R. V., primary, Klingelhöfer, G., additional, Schröder, C., additional, Rodionov, D. S., additional, Yen, A., additional, Ming, D. W., additional, de Souza, P. A., additional, Fleischer, I., additional, Wdowiak, T., additional, Gellert, R., additional, Bernhardt, B., additional, Evlanov, E. N., additional, Zubkov, B., additional, Foh, J., additional, Bonnes, U., additional, Kankeleit, E., additional, Gütlich, P., additional, Renz, F., additional, Squyres, S. W., additional, and Arvidson, R. E., additional

Published
2006
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30. Geochemical and mineralogical indicators for aqueous processes in the Columbia Hills of Gusev crater, Mars

Author

Ming, D. W., primary, Mittlefehldt, D. W., additional, Morris, R. V., additional, Golden, D. C., additional, Gellert, R., additional, Yen, A., additional, Clark, B. C., additional, Squyres, S. W., additional, Farrand, W. H., additional, Ruff, S. W., additional, Arvidson, R. E., additional, Klingelhöfer, G., additional, McSween, H. Y., additional, Rodionov, D. S., additional, Schröder, C., additional, de Souza, P. A., additional, and Wang, A., additional

Published
2006
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31. Overview of the Spirit Mars Exploration Rover Mission to Gusev Crater: Landing site to Backstay Rock in the Columbia Hills

Author

Arvidson, R. E., primary, Squyres, S. W., additional, Anderson, R. C., additional, Bell, J. F., additional, Blaney, D., additional, Brückner, J., additional, Cabrol, N. A., additional, Calvin, W. M., additional, Carr, M. H., additional, Christensen, P. R., additional, Clark, B. C., additional, Crumpler, L., additional, Des Marais, D. J., additional, de Souza, P. A., additional, d'Uston, C., additional, Economou, T., additional, Farmer, J., additional, Farrand, W. H., additional, Folkner, W., additional, Golombek, M., additional, Gorevan, S., additional, Grant, J. A., additional, Greeley, R., additional, Grotzinger, J., additional, Guinness, E., additional, Hahn, B. C., additional, Haskin, L., additional, Herkenhoff, K. E., additional, Hurowitz, J. A., additional, Hviid, S., additional, Johnson, J. R., additional, Klingelhöfer, G., additional, Knoll, A. H., additional, Landis, G., additional, Leff, C., additional, Lemmon, M., additional, Li, R., additional, Madsen, M. B., additional, Malin, M. C., additional, McLennan, S. M., additional, McSween, H. Y., additional, Ming, D. W., additional, Moersch, J., additional, Morris, R. V., additional, Parker, T., additional, Rice, J. W., additional, Richter, L., additional, Rieder, R., additional, Rodionov, D. S., additional, Schröder, C., additional, Sims, M., additional, Smith, M., additional, Smith, P., additional, Soderblom, L. A., additional, Sullivan, R., additional, Thompson, S. D., additional, Tosca, N. J., additional, Wang, A., additional, Wänke, H., additional, Ward, J., additional, Wdowiak, T., additional, Wolff, M., additional, and Yen, A., additional

Published
2006
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32. EXOMARS 2020 PROGRESS.

Author

Vago, J. L., Rodionov, D. S., Svedhem, H., Sefton-Nash, E., Baglioni, P., and Haldemann, A.

Subjects
SCIENCE conferences, PLANETARY science, MARTIAN surface, IR spectrometers, NEUTRON counters, GROUND penetrating radar, CARBONACEOUS chondrites (Meteorites)
Published
2019

33. Cross sections for low-energy inelastic Mg + H and Mg+ + H- collisions.

Author

Belyaev, A. K., Barklem, P. S., Spielfiedel, A., Guitou, M., Feautrier, N., Rodionov, D. S., and Vlasov, D. V.

Subjects
*NUCLEAR cross sections, *INELASTIC scattering, *QUANTUM scattering, *MAGNESIUM, *HYDROGEN, *ENERGY levels (Quantum mechanics), *NEUTRALIZATION (Chemistry), *ASTROPHYSICS
Abstract

We report full quantum scattering calculations for low-energy near-threshold inelastic cross sections in Mg + H and Mg+ + H- collisions. The calculations include all transitions between the eight lowest adiabatic MgH(2∑+) molecular states, with the uppermost of those diabatically extended to the ionic molecular state in the asymptotic region. This allows us to treat the excitation processes between the seven lowest atomic states of magnesium in collisions with hydrogen atoms, as well as the ion-pair production and the mutual neutralization processes. The collision energy range is from threshold up to 10 eV. These results are important for astrophysical modeling of spectra in stellar atmospheres. The processes in question are carefully examined and several process mechanisms are found. Some mechanisms are determined by interactions between ionic and covalent configurations at relatively large internuclear distances, while others are based on short-range nonadiabatic regions due to interactions between covalent configurations. [ABSTRACT FROM AUTHOR]

Published
2012
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