Matches in SemOpenAlex for { <https://semopenalex.org/work/W2461570443> ?p ?o ?g. }
Showing items 1 to 56 of
56
with 100 items per page.
- W2461570443 abstract "Comets are thought to be the most pristine bodies present in the Solar System. Inconsequence of spending the majority of their existence beyond 30 AU, their compositioncan give insights on the physical and chemical conditions during their formation. SinceAugust 2014 the European Space Agency spacecraft Rosetta accompanies the Jupiterfamily comet 67P/Churyumov-Gerasimenko on its way to perihelion and beyond. In thisstudy the isotope fractionation of 34S are reported in H2S, OCS, SO2, S2, and CS2 at 67P.In addition for the first time the isotope fractionation for 33S is presented for cometaryvolatiles. The ratio 32S/33S is given for H2S, SO2 and a tentative value is given for CS2.With a mean value of -50 ± 22‰ and -306 ± 31‰ for δ34S and δ33S respectively, H2Sshows a significant depletion in both 34S and 33S. For SO2 the depletion is less distinct withδ34S and δ33S being -67 ± 40‰ and -130 ± 53‰, respectively. The strongest depletion ispresent for CS2 with -114 ± 21‰and -276 ± 55‰, respectively. For OCS and S2 only δ34Scould be determined which is -252 ± 77‰ and -357 ± 145‰, respectively. A comparisonwith sulfur isotopic ratios measured in SiC grains revealed that both SiC grains and thefive volatile species have similar sulfur isotopic ratios. However, it is beyond the scopeof this work to investigate the possibility of a link between SiC grains and cometary ices.Nevertheless, mass-dependent or mass-independent fractionation due to photo dissociationcan be ruled out as sole cause of the seen depletion of 33S and 34S. Furthermore, an upperlimit of (9.64 ± 0.19)·10.4 for D/H in HDS has been determined. This value is about afactor two higher than D/H in H2O for the same comet reported by (Altwegg et al., 2015).Besides the investigation concerning isotopic ratios of sulfur bearing species in this workthe calibration and characterization of ROSINA/DFMS has been continued. Here it isreported about the deviation of the mass scale for MCP/LEDA low resolution spectra andthe calibration measurements performed in the laboratory. Furthermore the outcome of theattempt to describe the sensitivity of DFMS with an empirical function will be discussed.The last part of the characterization of DFMS is dedicated to determine the so-calledindividual pixel gain for the laboratory and the flight model. Moreover, correlation betweenthe depletion’s manifestation of the MCP with respect to the applied voltages has beeninvestigated for both models. It has been found that further measurements are neededto understand the manifestation of depletion at the laboratory model. For the model onboard of Rosetta it could be shown that most of the present feature are due to the usageof the MCP and suggestions have been made in order to answer the remaining questionconsidering the depletion of the MCP." @default.
- W2461570443 created "2016-07-22" @default.
- W2461570443 creator A5041200592 @default.
- W2461570443 date "2015-01-01" @default.
- W2461570443 modified "2023-09-25" @default.
- W2461570443 title "Sulfur Isotopic Ratios at 67P/Churyumov-Gerasimenko and Characterization of ROSINA-DFMS FM & FS" @default.
- W2461570443 doi "https://doi.org/10.7892/boris.81279" @default.
- W2461570443 hasPublicationYear "2015" @default.
- W2461570443 type Work @default.
- W2461570443 sameAs 2461570443 @default.
- W2461570443 citedByCount "0" @default.
- W2461570443 crossrefType "dissertation" @default.
- W2461570443 hasAuthorship W2461570443A5041200592 @default.
- W2461570443 hasConcept C102900547 @default.
- W2461570443 hasConcept C121332964 @default.
- W2461570443 hasConcept C127313418 @default.
- W2461570443 hasConcept C151730666 @default.
- W2461570443 hasConcept C164304813 @default.
- W2461570443 hasConcept C178790620 @default.
- W2461570443 hasConcept C185544564 @default.
- W2461570443 hasConcept C185592680 @default.
- W2461570443 hasConcept C2776152364 @default.
- W2461570443 hasConcept C2779870107 @default.
- W2461570443 hasConcept C2780416900 @default.
- W2461570443 hasConcept C518881349 @default.
- W2461570443 hasConcept C87355193 @default.
- W2461570443 hasConcept C94081185 @default.
- W2461570443 hasConcept C97428945 @default.
- W2461570443 hasConceptScore W2461570443C102900547 @default.
- W2461570443 hasConceptScore W2461570443C121332964 @default.
- W2461570443 hasConceptScore W2461570443C127313418 @default.
- W2461570443 hasConceptScore W2461570443C151730666 @default.
- W2461570443 hasConceptScore W2461570443C164304813 @default.
- W2461570443 hasConceptScore W2461570443C178790620 @default.
- W2461570443 hasConceptScore W2461570443C185544564 @default.
- W2461570443 hasConceptScore W2461570443C185592680 @default.
- W2461570443 hasConceptScore W2461570443C2776152364 @default.
- W2461570443 hasConceptScore W2461570443C2779870107 @default.
- W2461570443 hasConceptScore W2461570443C2780416900 @default.
- W2461570443 hasConceptScore W2461570443C518881349 @default.
- W2461570443 hasConceptScore W2461570443C87355193 @default.
- W2461570443 hasConceptScore W2461570443C94081185 @default.
- W2461570443 hasConceptScore W2461570443C97428945 @default.
- W2461570443 hasLocation W24615704431 @default.
- W2461570443 hasOpenAccess W2461570443 @default.
- W2461570443 hasPrimaryLocation W24615704431 @default.
- W2461570443 hasRelatedWork W2003643438 @default.
- W2461570443 hasRelatedWork W2094041311 @default.
- W2461570443 hasRelatedWork W2096703132 @default.
- W2461570443 hasRelatedWork W2167649042 @default.
- W2461570443 hasRelatedWork W2234882075 @default.
- W2461570443 hasRelatedWork W2808496234 @default.
- W2461570443 isParatext "false" @default.
- W2461570443 isRetracted "false" @default.
- W2461570443 magId "2461570443" @default.
- W2461570443 workType "dissertation" @default.