Stardust Interstellar Preliminary Examination VI: Quantitative elemental analysis by synchrotron X‐ray fluorescence nanoimaging of eight impact features in aerogel

Abstract Hard X‐ray, quantitative, fluorescence elemental imaging was performed on the ID 22 NI nanoprobe and ID 22 microprobe beam lines of the European Synchrotron Research facility ( ESRF ) in Grenoble, France, on eight interstellar candidate impact features in the framework of the NASA Stardust Interstellar Preliminary Examination ( ISPE ). Three features were unambiguous tracks, and the other five were identified as possible, but not …