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

Abstract

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 Fe-58 and Ni-58 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, similar to 10 nm lateral resolution and 30-40% useful yield.

Authors:
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Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
National Aeronautic and Space Administration (NASA); USDOE Office of Science - Office of Basic Energy Sciences - Materials Sciences and Engineering Division
OSTI Identifier:
1352606
DOE Contract Number:  
AC02-06CH11357
Resource Type:
Journal Article
Resource Relation:
Journal Name: International Journal of Mass Spectrometry; Journal Volume: 407
Country of Publication:
United States
Language:
English

Citation Formats

Stephan, Thomas, Trappitsch, Reto, Davis, Andrew M., Pellin, Michael J., Rost, Detlef, Savina, Michael R., Yokochi, Reika, and Liu, Nan. CHILI – the Chicago Instrument for Laser Ionization – a new tool for isotope measurements in cosmochemistry. United States: N. p., 2016. Web. doi:10.1016/j.ijms.2016.06.001.
Stephan, Thomas, Trappitsch, Reto, Davis, Andrew M., Pellin, Michael J., Rost, Detlef, Savina, Michael R., Yokochi, Reika, & Liu, Nan. CHILI – the Chicago Instrument for Laser Ionization – a new tool for isotope measurements in cosmochemistry. United States. doi:10.1016/j.ijms.2016.06.001.
Stephan, Thomas, Trappitsch, Reto, Davis, Andrew M., Pellin, Michael J., Rost, Detlef, Savina, Michael R., Yokochi, Reika, and Liu, Nan. Mon . "CHILI – the Chicago Instrument for Laser Ionization – a new tool for isotope measurements in cosmochemistry". United States. doi:10.1016/j.ijms.2016.06.001.
@article{osti_1352606,
title = {CHILI – the Chicago Instrument for Laser Ionization – a new tool for isotope measurements in cosmochemistry},
author = {Stephan, Thomas and Trappitsch, Reto and Davis, Andrew M. and Pellin, Michael J. and Rost, Detlef and Savina, Michael R. and Yokochi, Reika and Liu, Nan},
abstractNote = {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 Fe-58 and Ni-58 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, similar to 10 nm lateral resolution and 30-40% useful yield.},
doi = {10.1016/j.ijms.2016.06.001},
journal = {International Journal of Mass Spectrometry},
number = ,
volume = 407,
place = {United States},
year = {Mon Aug 01 00:00:00 EDT 2016},
month = {Mon Aug 01 00:00:00 EDT 2016}
}