CHILI – the Chicago Instrument for Laser Ionization – a new tool for isotope measurements in cosmochemistry

[Display omitted] •CHILI is a new resonance ionization mass spectrometer at the University of Chicago.•CHILI has been developed for isotopic analysis of small samples in cosmochemistry.•CHILI combines high spatial resolution and high sensitivity.•Sr, Ba, Fe, and Ni isotopes have been measured in pre...

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Veröffentlicht in:International journal of mass spectrometry 2016-08, Vol.407 (C), p.1-15
Hauptverfasser: Stephan, Thomas, Trappitsch, Reto, Davis, Andrew M., Pellin, Michael J., Rost, Detlef, Savina, Michael R., Yokochi, Reika, Liu, Nan
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container_end_page 15
container_issue C
container_start_page 1
container_title International journal of mass spectrometry
container_volume 407
creator Stephan, Thomas
Trappitsch, Reto
Davis, Andrew M.
Pellin, Michael J.
Rost, Detlef
Savina, Michael R.
Yokochi, Reika
Liu, Nan
description [Display omitted] •CHILI is a new resonance ionization mass spectrometer at the University of Chicago.•CHILI has been developed for isotopic analysis of small samples in cosmochemistry.•CHILI combines high spatial resolution and high sensitivity.•Sr, Ba, Fe, and Ni isotopes have been measured in presolar grains.•A new timing scheme allows analysis of all Fe and Ni isotopes without interferences. We describe CHILI, the Chicago Instrument for Laser Ionization, a new resonance ionization mass spectrometer developed for isotopic analysis at high spatial resolution and high sensitivity of small samples like contemporary interstellar dust grains returned by the Stardust spacecraft. We explain how CHILI addresses the technical challenges associated with such analyses by pushing most technical specifications towards their physical limits. As an initial demonstration, after many years of designing and developing CHILI, we have analyzed presolar silicon carbide grains for their isotopic compositions of strontium, zirconium, and barium. Subsequently, after further technical improvements, we have used CHILI to analyze, for the first time without interference, all stable isotopes of iron and nickel simultaneously in presolar silicon carbide grains. With a special timing scheme for the ionization lasers, we separated iron and nickel isotopes in the time-of-flight spectrum such that the isobaric interference between 58Fe and 58Ni was resolved. In-depth discussion of the astrophysical implications of the presolar grain results is deferred to dedicated later publications. Here we focus on the technical aspects of CHILI, its status quo, and further developments necessary to achieve CHILI’s ultimate goals, ∼10nm lateral resolution and 30–40% useful yield.
doi_str_mv 10.1016/j.ijms.2016.06.001
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subjects ASTRONOMY AND ASTROPHYSICS
Cosmochemistry
ENGINEERING
INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY
Isobaric interference
Isotopes
Resonance ionization mass spectrometry
title CHILI – the Chicago Instrument for Laser Ionization – a new tool for isotope measurements in cosmochemistry
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