TY  - JOUR
A1  - Quirico, E.
A1  - Moroz, Liubov V.
A1  - Schmitt, B.
A1  - Arnold, Gabriele
A1  - Faure, M.
A1  - Beck, P.
A1  - Bonal, L.
A1  - Ciarniello, M.
A1  - Capaccioni, F.
A1  - Filacchione, G.
A1  - Erard, S.
A1  - Leyrat, C.
A1  - Bockelee-Morvan, D.
A1  - Zinzi, A.
A1  - Palomba, E.
A1  - Drossart, P.
A1  - Tosi, F.
A1  - Capria, M. T.
A1  - De Sanctis, M. C.
A1  - Raponi, A.
A1  - Fonti, S.
A1  - Mancarella, F.
A1  - Orofino, V.
A1  - Barucci, A.
A1  - Blecka, M. I.
A1  - Carlson, R.
A1  - Despan, D.
A1  - Faure, A.
A1  - Fornasier, S.
A1  - Gudipati, M. S.
A1  - Longobardo, A.
A1  - Markus, K.
A1  - Mennella, V.
A1  - Merlin, F.
A1  - Piccioni, G.
A1  - Rousseau, B.
A1  - Taylor, F.
T1  - Refractory and semi-volatile organics at the surface of comet 67P/Churyumov-Gerasimenko: Insights from the VIRTIS/Rosetta imaging spectrometer
JF  - Icarus : international journal of solar system studies
N2  - The VIRTIS (Visible, Infrared and Thermal Imaging Spectrometer) instrument aboard the Rosetta spacecraft has performed extensive spectral mapping of the surface of comet 67P/Churyumov-Gerasimenko in the range 0.3-5 mu m. The reflectance spectra collected across the surface display a low reflectance factor over the whole spectral range, two spectral slopes in the visible and near-infrared ranges and a broad absorption band centered at 3.2 mu m. The first two of these characteristics are typical of dark small bodies of the Solar System and are difficult to interpret in terms of composition. Moreover, solar wind irradiation may modify the structure and composition of surface materials and there is no unequivocal interpretation of these spectra devoid of vibrational bands. To circumvent these problems, we consider the composition of cometary grains analyzed in the laboratory to constrain the nature of the cometary materials and consider results on surface rejuvenation and solar wind processing provided by the OSIRIS and ROSINA instruments, respectively. Our results lead to five main conclusions: (i) The low albedo of comet 67P/CG is accounted for by a dark refractory polyaromatic carbonaceous component mixed with opaque minerals. VIRTIS data do not provide direct insights into the nature of these opaque minerals. However, according to the composition of cometary grains analyzed in the laboratory, we infer that they consist of Fe-Ni alloys and FeS sulfides. (ii) A semi-volatile component, consisting of a complex mix of low weight molecular species not volatilized at T similar to 220 K, is likely a major carrier of the 3.2 p.m band. Water ice contributes significantly to this feature in the neck region but not in other regions of the comet. COOH in carboxylic acids is the only chemical group that encompasses the broad width of this feature. It appears as a highly plausible candidate along with the NH4+ ion. (iii) Photolytic/thermal residues, produced in the laboratory from interstellar ice analogs, are potentially good spectral analogs. (iv) No hydrated minerals were identified and our data support the lack of genetic links with the CI, CR and CM primitive chondrites. This concerns in particular the Orgueil chondrite, previously suspected to have been of cometary origin. (v) The comparison between fresh and aged terrains revealed no effect of solar wind irradiation on the 3.2 mu m band. This is consistent with the presence of efficient resurfacing processes such as dust transport from the interior to the surface, as revealed by the OSIRIS camera. (C) 2016 Elsevier Inc. All rights reserved.
KW  - Comets
KW  - Organic chemistry
KW  - Infrared observations
KW  - Meteorites
KW  - Spectrophotometry
Y1  - 2016
U6  - https://doi.org/10.1016/j.icarus.2016.02.028
SN  - 0019-1035
SN  - 1090-2643
VL  - 272
SP  - 32
EP  - 47
PB  - Elsevier
CY  - San Diego
ER  - 
TY  - JOUR
A1  - Tosi, Federico
A1  - Capaccioni, F.
A1  - Capria, M. T.
A1  - Mottola, Stefano
A1  - Zinzi, A.
A1  - Ciarniello, M.
A1  - Filacchione, G.
A1  - Hofstadter, M.
A1  - Fonti, S.
A1  - Formisano, M.
A1  - Kappel, David
A1  - Kührt, E.
A1  - Leyrat, C.
A1  - Vincent, J-B
A1  - Arnold, G.
A1  - De Sanctis, M. C.
A1  - Longobardo, Andrea
A1  - Palomba, E.
A1  - Raponi, A.
A1  - Rousseau, Batiste
A1  - Schmitt, Bernard
A1  - Barucci, Maria Antonietta
A1  - Bellucci, Giancarlo
A1  - Benkhoff, Johannes
A1  - Bockelee-Morvan, D.
A1  - Cerroni, P.
A1  - Combe, J-Ph
A1  - Despan, D.
A1  - Erard, Stéphane
A1  - Mancarella, F.
A1  - McCord, T. B.
A1  - Migliorini, Alessandra
A1  - Orofino, V
A1  - Piccioni, G.
T1  - The changing temperature of the nucleus of comet 67P induced by morphological and seasonal effects
JF  - Nature astronomy
N2  - Knowledge of the surface temperature distribution on a comet’s nucleus and its temporal evolution at different timescales is key to constraining its thermophysical properties and understanding the physical processes that take place at and below the surface. Here we report on time-resolved maps of comet 67P/Churyumov–Gerasimenko retrieved on the basis of infrared data acquired by the Visible InfraRed and Thermal Imaging Spectrometer (VIRTIS) onboard the Rosetta orbiter in 2014, over a roughly two-month period in the pre-perihelion phase at heliocentric distances between 3.62 and 3.31 au from the Sun. We find that at a spatial resolution ≤15 m per pixel, the measured temperatures point out the major effect that self-heating, due to the complex shape of the nucleus, has on the diurnal temperature variation. The bilobate nucleus of comet 67P also induces daytime shadowing effects, which result in large thermal gradients. Over longer periods, VIRTIS-derived temperature values reveal seasonal changes driven by decreasing heliocentric distance combined with an increasing abundance of ice within the uppermost centimetre-thick layer, which implies the possibility of having a largely pristine nucleus interior already in the shallow subsurface
Y1  - 2019
U6  - https://doi.org/10.1038/s41550-019-0740-0
SN  - 2397-3366
VL  - 3
IS  - 7
SP  - 649
EP  - 658
PB  - Nature Publ. Group
CY  - London
ER  - 
TY  - JOUR
A1  - Rousseau, Batiste
A1  - Erard, Stéphane
A1  - Beck, P.
A1  - Quirico, Eric
A1  - Schmitt, B.
A1  - Brissaud, O.
A1  - Montes-Hernandez, G.
A1  - Capaccioni, F.
A1  - Filacchione, Gianrico
A1  - Bockelee-Morvan, Dominique
A1  - Leyrat, C.
A1  - Ciarniello, M.
A1  - Raponi, Andrea
A1  - Kappel, David
A1  - Arnold, G.
A1  - Moroz, L. V.
A1  - Palomba, Ernesto
A1  - Tosi, Federico
T1  - Laboratory simulations of the Vis-NIR spectra of comet 67P using sub-mu m sized cosmochemical analogues
JF  - Icarus : international journal of solar system studies
N2  - Laboratory spectral measurements of relevant analogue materials were performed in the framework of the Rosetta mission in order to explain the surface spectral properties of comet 67P. Fine powders of coal, iron sulphides, silicates and their mixtures were prepared and their spectra measured in the Vis-IR range. These spectra are compared to a reference spectrum of 67P nucleus obtained with the VIRTIS/Rosetta instrument up to 2.7 mu m, excluding the organics band centred at 3.2 mu m. The species used are known to be chemical analogues for cometary materials which could be present at the surface of 67P. Grain sizes of the powders range from tens of nanometres to hundreds of micrometres. Some of the mixtures studied here actually reach the very low reflectance level observed by VIRTIS on 67P. The best match is provided by a mixture of sub-micron coal, pyrrhotite, and silicates. Grain sizes are in agreement with the sizes of the dust particles detected by the GIADA, MIDAS and COSIMA instruments on board Rosetta. The coal used in the experiment is responsible for the spectral slope in the visible and infrared ranges. Pyrrhotite, which is strongly absorbing, is responsible for the low albedo observed in the NIR. The darkest components dominate the spectra, especially within intimate mixtures. Depending on sample preparation, pyrrhotite can coat the coal and silicate aggregates. Such coating effects can affect the spectra as much as particle size. In contrast, silicates seem to play a minor role. (c) 2017 Elsevier Inc. All rights reserved.
KW  - Comets
KW  - Comets nucleus
KW  - Comets composition
KW  - Spectroscopy
KW  - Experimental techniques
Y1  - 2018
U6  - https://doi.org/10.1016/j.icarus.2017.10.015
SN  - 0019-1035
SN  - 1090-2643
VL  - 306
SP  - 306
EP  - 318
PB  - Elsevier
CY  - San Diego
ER  - 
TY  - JOUR
A1  - Sun, Y. -P.
A1  - Hennies, Franz
A1  - Pietzsch, Annette
A1  - Kennedy, B.
A1  - Schmitt, Thorsten
A1  - Strocov, Vladimir N.
A1  - Andersson, Joakim
A1  - Berglund, Martin
A1  - Rubensson, Jan-Erik
A1  - Aidas, K.
A1  - Gel'mukhanov, F.
A1  - Odelius, Michael
A1  - Föhlisch, Alexander
T1  - Intramolecular soft modes and intermolecular interactions in liquid acetone
JF  - Physical review : B, Condensed matter and materials physics
N2  - Resonant inelastic x-ray scattering spectra excited at the O1s(-1)pi* resonance of liquid acetone are presented. Scattering to the electronic ground state shows a resolved vibrational progression where the dominant contribution is due to the C-O stretching mode, thus demonstrating a unique sensitivity of the method to the local potential energy surface in complex molecular systems. For scattering to electronically excited states, soft vibrational modes and, to a smaller extent, intermolecular interactions give a broadening, which blurs the vibrational fine structure. It is predicted that environmental broadening is dominant in aqueous acetone.
Y1  - 2011
U6  - https://doi.org/10.1103/PhysRevB.84.132202
SN  - 1098-0121
VL  - 84
IS  - 13
PB  - American Physical Society
CY  - College Park
ER  - 
TY  - JOUR
A1  - Pietzsch, Annette
A1  - Sun, Y. -P.
A1  - Hennies, Franz
A1  - Rinkevicius, Z.
A1  - Karlsson, Hans O.
A1  - Schmitt, Thorsten
A1  - Strocov, Vladimir N.
A1  - Andersson, Joakim
A1  - Kennedy, B.
A1  - Schlappa, J.
A1  - Föhlisch, Alexander
A1  - Rubensson, Jan-Erik
A1  - Gel'mukhanov, F.
T1  - Spatial quantum beats in vibrational resonant inelastic soft X-ray scattering at dissociating states in oxygen
JF  - Physical review letters
N2  - Resonant inelastic soft x-ray scattering (RIXS) spectra excited at the 1 sigma(g) -> 3 sigma(u) resonance in gas-phase O-2 show excitations due to the nuclear degrees of freedom with up to 35 well-resolved discrete vibronic states and a continuum due to the kinetic energy distribution of the separated atoms. The RIXS profile demonstrates spatial quantum beats caused by two interfering wave packets with different momenta as the atoms separate. Thomson scattering strongly affects both the spectral profile and the scattering anisotropy.
Y1  - 2011
U6  - https://doi.org/10.1103/PhysRevLett.106.153004
SN  - 0031-9007
VL  - 106
IS  - 15
PB  - American Physical Society
CY  - College Park
ER  - 
TY  - JOUR
A1  - Sun, Y. -P.
A1  - Miao, Q.
A1  - Pietzsch, Annette
A1  - Hennies, F.
A1  - Schmitt, T.
A1  - Strocov, V. N.
A1  - Andersson, Joakim
A1  - Kennedy, B.
A1  - Schlappa, J.
A1  - Föhlisch, Alexander
A1  - Gel&rsquo, 
A1  - mukhanov, F.
A1  - Rubensson, J. -E.
T1  - Interference between Resonant and Nonresonant Inelastic X-Ray Scattering
JF  - PHYSICAL REVIEW LETTERS
N2  - A detailed study of inelastic x-ray scattering from the ground state to the (3)Sigma(g)(3 sigma(-1)(g)3s(g)(1)) state of the O-2 molecule is presented. The observed angular anisotropy shows that the vibrational excitations within this final state are strongly dependent on the polarization of the incident radiation. The analysis demonstrates that this is a manifestation of interference between resonant and direct nonresonant inelastic x-ray scattering. This interference provides a new tool to monitor nuclear dynamics by relative rotation of the polarization vectors of the incident and scattered photons.
Y1  - 2013
U6  - https://doi.org/10.1103/PhysRevLett.110.223001
SN  - 0031-9007
VL  - 110
IS  - 22
PB  - AMER PHYSICAL SOC
CY  - COLLEGE PK
ER  - 
TY  - JOUR
A1  - Sun, Y-P
A1  - Pietzsch, Annette
A1  - Hennies, Franz
A1  - Rinkevicius, Z.
A1  - Karlsson, Hans O.
A1  - Schmitt, Thorsten
A1  - Strocov, Vladimir N.
A1  - Andersson, Joakim
A1  - Kennedy, B.
A1  - Schlappa, J.
A1  - Föhlisch, Alexander
A1  - Gel'mukhanov, F.
A1  - Rubensson, Jan-Erik
T1  - Internal symmetry and selection rules in resonant inelastic soft x-ray scattering
JF  - Journal of physics : B, Atomic, molecular and optical physics
N2  - Resonant inelastic soft x-ray scattering spectra excited at the dissociative 1 sigma(g) -> 3 sigma(u) resonance in gas-phase O(2) are presented and discussed in terms of state-of-the-art molecular theory. A new selection rule due to internal spin coupling is established, facilitating a deep analysis of the valence excited final states. Furthermore, it is found that a commonly accepted symmetry selection rule due to orbital parity breaks down, as the core hole and excited electron swap parity, thereby opening the symmetry forbidden 3 sigma(g) decay channel.
Y1  - 2011
U6  - https://doi.org/10.1088/0953-4075/44/16/161002
SN  - 0953-4075
VL  - 44
IS  - 16
PB  - IOP Publ. Ltd.
CY  - Bristol
ER  - 
TY  - JOUR
A1  - Insel, N.
A1  - Grove, M.
A1  - Haschke, Michael
A1  - Barnes, J. B.
A1  - Schmitt, Axel K.
A1  - Strecker, Manfred
T1  - Paleozoic to early Cenozoic cooling and exhumation of the basement underlying the eastern Puna plateau margin prior to plateau growth
JF  - Tectonics
N2  - Constraining the pre-Neogene history of the Puna plateau is crucial for establishing the initial conditions that attended the early stage evolution of the southern extent of the Andean plateau. We apply high-to low-temperature thermochronology data from plutonic rocks in northwestern Argentina to quantify the Paleozoic, Mesozoic and early Tertiary cooling history of the Andean crust. U-Pb crystallization ages of zircons indicate that pluton intrusion occurred during the early mid-Ordovician (490-470 Ma) and the late Jurassic (160-150 Ma). Lower-temperature cooling histories from Ar-40/Ar-39 analyses of K-feldspar vary substantially. Basement rocks underlying the western Puna resided at temperatures below 200 degrees C (<6 km depth) since the Devonian (similar to 400 Ma). In contrast, basement rocks underlying the southeastern Puna were hotter (similar to 200-300 degrees C) throughout the Paleozoic and Jurassic and cooled to temperatures of <200 degrees C by similar to 120 Ma. The southeastern Puna basement records a rapid cooling phase coeval with active extension of the Cretaceous Salta rift at similar to 160-100 Ma that we associate with tectonic faulting and lithospheric thinning. The northeastern Puna experienced protracted cooling until the late Cretaceous with temperatures <200 degrees C during the Paleocene. Higher cooling rates between 78 and 55 Ma are associated with thermal subsidence during the postrift stage of the Salta rift and/or shortening-related flexural subsidence. Accelerated cooling and deformation during the Eocene was focused within a narrow zone along the eastern Puna/Eastern Cordillera transition that coincides with Paleozoic/Mesozoic structural and thermal boundaries. Our results constrain regional erosion-induced cooling throughout the Cenozoic to have been less than similar to 150 degrees C, which implies total Cenozoic denudation of <6-4 km.
Y1  - 2012
U6  - https://doi.org/10.1029/2012TC003168
SN  - 0278-7407
VL  - 31
IS  - 23
PB  - American Geophysical Union
CY  - Washington
ER  - 
TY  - INPR
A1  - Asendorpf, Jens B.
A1  - Conner, Mark
A1  - De Fruyt, Filip
A1  - De Houwer, Jan
A1  - Denissen, Jaap J. A.
A1  - Fiedler, Klaus
A1  - Fiedler, Susann
A1  - Funder, David C.
A1  - Kliegl, Reinhold
A1  - Nosek, Brian A.
A1  - Perugini, Marco
A1  - Roberts, Brent W.
A1  - Schmitt, Manfred
A1  - Van Aken, Marcel A. G.
A1  - Weber, Hannelore
A1  - Wicherts, Jelte M.
T1  - Replication is more than hitting the lottery twice
T2  - European journal of personality
N2  - The main goal of our target article was to provide concrete recommendations for improving the replicability of research findings. Most of the comments focus on this point. In addition, a few comments were concerned with the distinction between replicability and generalizability and the role of theory in replication. We address all comments within the conceptual structure of the target article and hope to convince readers that replication in psychological science amounts to much more than hitting the lottery twice.
Y1  - 2013
SN  - 0890-2070
VL  - 27
IS  - 2
SP  - 138
EP  - 144
PB  - Wiley-Blackwell
CY  - Hoboken
ER  - 
TY  - JOUR
A1  - Asendorpf, Jens B.
A1  - Conner, Mark
A1  - De Fruyt, Filip
A1  - De Houwer, Jan
A1  - Denissen, Jaap J. A.
A1  - Fiedler, Klaus
A1  - Fiedler, Susann
A1  - Funder, David C.
A1  - Kliegl, Reinhold
A1  - Nosek, Brian A.
A1  - Perugini, Marco
A1  - Roberts, Brent W.
A1  - Schmitt, Manfred
A1  - vanAken, Marcel A. G.
A1  - Weber, Hannelore
A1  - Wicherts, Jelte M.
T1  - Recommendations for increasing replicability in psychology
JF  - European journal of personality
N2  - Replicability of findings is at the heart of any empirical science. The aim of this article is to move the current replicability debate in psychology towards concrete recommendations for improvement. We focus on research practices but also offer guidelines for reviewers, editors, journal management, teachers, granting institutions, and university promotion committees, highlighting some of the emerging and existing practical solutions that can facilitate implementation of these recommendations. The challenges for improving replicability in psychological science are systemic. Improvement can occur only if changes are made at many levels of practice, evaluation, and reward.
KW  - replicability
KW  - confirmation bias
KW  - publication bias
KW  - generalizability
KW  - research transparency
Y1  - 2013
U6  - https://doi.org/10.1002/per.1919
SN  - 0890-2070
VL  - 27
IS  - 2
SP  - 108
EP  - 119
PB  - Wiley-Blackwell
CY  - Hoboken
ER  -