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UID:DSC-13397
DTSTART;TZID=Europe/Berlin:20170928T100000
SEQUENCE:1506584484
TRANSP:OPAQUE
DTEND;TZID=Europe/Berlin:20170928T113000
URL:https://dresden-science-calendar.de/calendar/de/detail/13397
LOCATION:HZDR\, Bautzner Landstraße 40001328 Dresden
SUMMARY:Steppert: Vortrag Michael Steppert
CLASS:PUBLIC
DESCRIPTION:Speaker: Michael Steppert\nInstitute of Speaker: \nTopics:\nPhy
 sik\n Location:\n  Name: HZDR (801/P142 - Seminarraum FWO)\n  Street: Baut
 zner Landstraße 400\n  City: 01328 Dresden\n  Phone: \n  Fax: \nDescripti
 on: Update on the ESI-Orbitrap mass spectrometer: redesign of the ion sour
 ce region and its implications for measurements in aquatic systems and fir
 st MS/MS-data on molybdenum species in strongly acidic media  Dr. Michael 
 Steppert Institut für Radioökologie und Strahlenschutz\, Leibniz Univers
 ität Hannover  The ESI-Orbitrap Elite hybrid mass spectrometer (IRS Hanov
 er) can transfer ions from solutions to the gas phase and analyze their ma
 ss-to-charge ratios. Compared to the ESI-ToF-MS applied by our group befor
 e\, the new device has advantages in terms of sensitivity and mass resolut
 ion. However it also has a drawback of generating measurement artifacts\, 
 due to the more invasive transfer from atmospheric pressure to the vacuum.
  These artifacts are forming due to collision-induced dissociation reactio
 ns of the ions of interest\, as the whole solvent shell of the ions is rem
 oved in the transfer region. In order to suppress these artifacts\, the so
 urce region of the device was redesigned to generate softer sampling condi
 tions. Advantages\, drawbacks and their implications on speciation measure
 ments by the ESI-Orbitrap will be discussed. The second part of the talk i
 s dedicated to MS/MS-investigations on molybdenum in strongly acidic media
 . Being a possible candidate as an inert fuel matrix for new proposed reac
 tor types\, understanding the molybdenum chemistry in strongly acidic medi
 a is important for the reprocessing steps. We reported the results on the 
 stoichiometry and relative abundances of the molybdenum solution species a
 t the IRE seminar before. However\, the structures of these species remain
 ed unclear. To shed light on the structural properties of these species we
  applied MS/MS-techniques. We will propose possible structures that might 
 be a good starting point for quantum chemical calculations on the cationic
  molybdenum species present in solution.
DTSTAMP:20260510T020148Z
CREATED:20170905T074443Z
LAST-MODIFIED:20170928T074124Z
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