Search Results - "Gunnlaugsson, H.P."

Determination of the wind induced detachment threshold for granular material on Mars using wind tunnel simulations by Merrison, J.P., Gunnlaugsson, H.P., Nørnberg, P., Jensen, A.E., Rasmussen, K.R.

“…Experimental results are presented of wind induced grain detachment under Mars simulation conditions. A simple force balance equation is applied to quantify…”
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Mineral alteration induced by sand transport: A source for the reddish color of martian dust by Merrison, J.P., Gunnlaugsson, H.P., Knak Jensen, S., Nørnberg, P.

“…The iron mineral thought to give the characteristic reddish color to martian dust could have formed through mechanical activation during sand transport. This…”
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Mössbauer isomer-shift of ferrous iron impurities in ionic and covalent binary compounds by Gunnlaugsson, H.P., Masenda, H.

“…We have developed an empirical model to determine Mössbauer isomer-shift of dilute Fe2+ impurities in ionic and covalent binary compounds, where at least one…”
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H₂O at the Phoenix Landing Site by Smith, P.H, Tamppari, L.K, Arvidson, R.E, Bass, D, Blaney, D, Boynton, W.V, Carswell, A, Catling, D.C, Clark, B.C, Duck, T, DeJong, E, Fisher, D, Goetz, W, Gunnlaugsson, H.P, Hecht, M.H, Hipkin, V, Hoffman, J, Hviid, S.F, Keller, H.U, Kounaves, S.P, Lange, C.F, Lemmon, M.T, Madsen, M.B, Markiewicz, W.J, Marshall, J, McKay, C.P, Mellon, M.T, Ming, D.W, Morris, R.V, Pike, W.T, Renno, N, Staufer, U, Stoker, C, Taylor, P, Whiteway, J.A, Zent, A.P

“…The Phoenix mission investigated patterned ground and weather in the northern arctic region of Mars for 5 months starting 25 May 2008 (solar longitude between…”
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High-pressure X-ray diffraction and Mössbauer spectroscopy study of Fe1.087Te by Bremholm, M., Gunnlaugsson, H.P., Jørgensen, J.-E.

“…The compression mechanism of Fe1.087Te was studied by high-pressure X-ray diffraction at ambient temperature. Fe1.087Te retains tetragonal symmetry up to the…”
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Metal-insulator transition in crystalline V2O3 thin films probed at atomic-scale using emission Mössbauer spectroscopy by Qi, B., Gunnlaugsson, H.P., Ólafsson, S., Gislason, H.P., Thorsteinsson, E.B., Arnalds, U.B., Mantovan, R., Unzueta l, I., Zyabkin, D.V., Ram, K.Bharuth, Johnston, K., Krastev, P.B., Mølholt, T.E., Masenda, H., Martín-Luengo, A.Tarazaga, Naidoo, D., Schell, J.

“…•Local metal-insulator transition (MIT) in V2O3 thin films is probed at the atomic scale.•The 57Fe online emission mössbauer spectroscopy was applied.•The…”
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57Fe Mössbauer study of radiation damage in ion-implanted Si, SiGe and SiSn by Gunnlaugsson, H.P, Fanciulli, M, Dietrich, M, Bharuth-Ram, K, Sielemann, R, Weyer, G, Collaboration, ISOLDE

“…The radiation damage created in silicon-based materials by ion implantation of radioactive 57Mn ions at temperatures of 77–500 K has been studied by Mössbauer…”
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57Fe Mössbauer study of epitaxial TiN thin film grown on MgO (1 0 0) by magnetron sputtering by Qi, B., Gunnlaugsson, H.P., Mokhles Gerami, A., Gislason, H.P., Ólafsson, S., Magnus, F., Mølholt, T.E., Masenda, H., Tarazaga Martín-Lueugo, A., Bonanni, A., Krastev, P.B., Masondo, V., Unzueta, I., Bharuth-Ram, K., Johnston, K., Naidoo, D., Schell, J., Schaaf, P.

“…[Display omitted] •57Fe Mössbauer spectroscopy at truly dilute level (<10−3 at%) is applied.•An ultrathin epitaxial TiN thin film structure is…”
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Local increase of the Curie temperature in Mn/Fe implanted Y3Fe5O12 (YIG) by Krastev, P.B., Gunnlaugsson, H.P., Nomura, K., Bharuth-Ram, K., Qi, B., Masenda, H., Mølholt, T.E., Naidoo, D., Ólafsson, S., Martín-Luengo, A. Tarazaga, Unzueta, I., Johnston, K., Schell, J., Gislason, H.P.

“…The change in the Curie temperature of single crystalline garnet Y3Fe5O12 (YIG) sample due to lattice damage induced by ion implantation has been investigated…”
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Lattice sites, charge states and spin–lattice relaxation of Fe ions in 57 Mn + implanted GaN and AlN by Masenda, H., Naidoo, D., Bharuth-Ram, K., Gunnlaugsson, H.P., Johnston, K., Mantovan, R., Mølholt, T.E., Ncube, M., Shayestehaminzadeh, S., Gíslason, H.P., Langouche, G., Ólafsson, S., Weyer, G.

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Lattice sites, charge states and spin–lattice relaxation of Fe ions in 57Mn+ implanted GaN and AlN by Masenda, H., Naidoo, D., Bharuth-Ram, K., Gunnlaugsson, H.P., Johnston, K., Mantovan, R., Mølholt, T.E., Ncube, M., Shayestehaminzadeh, S., Gíslason, H.P., Langouche, G., Ólafsson, S., Weyer, G.

“…The lattice sites, valence states, resulting magnetic behaviour and spin–lattice relaxation of Fe ions in GaN and AlN were investigated by emission Mössbauer…”
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The Stardalur magnetic anomaly revisited—New insights into a complex cooling and alteration history by Vahle, C., Kontny, A., Gunnlaugsson, H.P., Kristjansson, L.

“…This study provides new rock magnetic and magneto-mineralogical data including Mössbauer spectroscopy of basaltic drill cores from the Stardalur volcanic…”
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Factors affecting the electrification of wind-driven dust studied with laboratory simulations by Merrison, J.P., Gunnlaugsson, H.P., Hogg, M.R., Jensen, M., Lykke, J.M., Madsen, M.Bo, Nielsen, M.B., Nørnberg, P., Ottosen, T.A., Pedersen, R.T., Pedersen, S., Sørensen, A.V.

“…The electrification of wind-blown dust grains was studied in a series of laboratory experiments to examine how grain electrification depends on grain size,…”
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Magnetic study of an Antarctic weathering profile on basalt: Implications for recent weathering on Mars by Chevrier, V., Mathé, P.-E., Rochette, P., Gunnlaugsson, H.P.

“…In order to better interpret the Martian surface weathering-related mineralogy, we focused on a relevant analogue of the Martian subsurface in terms of…”
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Defect annealing in Sb/Sn implanted diamond investigated with 119Sn Mössbauer spectroscopy by Bharuth-Ram, K., Gunnlaugsson, H.P., Masenda, H., Sielemann, R., Weyer, G., Köster, U.

“…The annealing of defects in Sb/Sn implanted diamond has been studied in 119Sn Mössbauer spectroscopy following the implantation of radioactive parent isotopes…”
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Salten Skov I: A Martian magnetic dust analogue by Nørnberg, P., Gunnlaugsson, H.P., Merrison, J.P., Vendelboe, A.L.

“…A fine grained magnetic iron oxide precipitate found in Denmark has been studied with regard to grain size, magnetic properties, aerosol transport, grain…”
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Magnetic Properties Experiments on the Mars Exploration Rover Spirit at Gusev Crater by Bertelsen, P., Goetz, W., Madsen, M. B., Kinch, K. M., Hviid, S. F., Knudsen, J. M., Gunnlaugsson, H. P., Merrison, J., Nørnberg, P., Squyres, S. W., Bell, J. F., Herkenhoff, K. E., Gorevan, S., Yen, A. S., Myrick, T., Klingelhöfer, G., Rieder, R., Gellert, R.

“…The magnetic properties experiments are designed to help identify the magnetic minerals in the dust and rocks on Mars-and to determine whether liquid water was…”
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Aeolian comminution experiments revealing surprising sandball mineral aggregates by Nørnberg, P., Bak, E., Finster, K., Gunnlaugsson, H.P., Iversen, J.J., Jensen, S. Knak, Merrison, J.P.

“…We have undertaken a set of wind erosion experiments on a simple and well defined mineral, quartz. In these experiments wind action is simulated by end over…”
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57Fe Mössbauer studies on 57Mn ∗ implanted InP and InAs by Bharuth-Ram, K., Dlamini, W.B., Masenda, H., Naidoo, D., Gunnlaugsson, H.P., Weyer, G., Mantovan, R., Mølholt, T.E., Sielemann, R., Ólafsson, S., Langouche, G., Johnston, K.

“…57Fe Mössbauer spectroscopy studies, following implantation of radioactive 57 Mn ∗ , have been conducted on InP and n- and p-type InAs at temperatures above…”
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New analysis of the Mössbauer spectra of olivine basalt rocks from Gusev crater on Mars by Gunnlaugsson, H.P., Rasmussen, H., Madsen, M.B., Nørnberg, P.

“…The Mars Exploration Rover, Spirit, landed on 4 January 2004, in a lava field in Gusev crater on Mars. Samples interpreted as olivine basalt have been…”
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