12.07.2012: Fachvortrag zum Thema Clumped Isotopes

Donnerstag, 12.7.2012 -  13:00 Uhr - GEOMAR Wischhofstr. 1-3, Geb.8A - R.101 [grosser Konferenzraum über Haupteingang]


Andreas W. Hilkert, Michael Deerberg, Hans-Jürgen Schlüter, Johannes Schwieters

Thermo Fisher Scientific, Bremen, Germany
HIGH RESOLUTION DOUBLE FOCUSING ISOTOPE RATIO MS

In the last decade isotope ratio measurements have been extended exploring very small isotope signatures related with small isotope abundances and extended dynamic ranges in the targeted isotope systems such as isotopomers and isotopologues containing clumped isotopes. Consequently, additional properties of an isotope ratio mass spectrometer are under investigation beside the mandatory high sensitivity in combination with high stability and isotope ratio linearity. Improvements on signal to noise by enhancing ion beam amplification on faraday cups, low gain secondary electron multiplying and ion counting in combination with high sensitivity EI ion sources are addressing the small ion beam requirements. Fully automated arrangement of the cups in the multicollector and choice of collection type and amplification are making such a system a versatile research tool. The quality of ion beams at low abundance in an isotope system is often endangered by interfering isotopologues or isobaric ions of contaminants with the same nominal mass. Resolving such interferences by medium or high mass resolution is the method of choice for accurate quantification of low abundant ion beams. We are presenting the first results of a high resolution double focusing isotope ratio MS, the MAT 253 Ultra.