New instrument for microbeam analysis incorporating submicron imaging and resonance ionization mass spectrometry

Ma, Z.; Thompson, R. N.; Lykke, Keith R.; Pellin, Michael J.; Davis, A. M.

doi:10.1063/1.1145546

Cited by 51 publications

(31 citation statements)

References 16 publications

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“…Barium isotopic compositions were measured by Resonant Ionization Mass Spectrometry (RIMS) on the CHARISMA instrument at Argonne National Laboratory, which has been previously described in detail elsewhere (Ma et al, 1995;Nicolussi et al, 1997b). A description of the most recent version of the instrument, along with a detailed procedure for the barium analysis, is given in a companion article in this issue (Savina et al, 2003).…”

Section: Ba Isotopes In Murchison Presolar Sic Grainsmentioning

confidence: 99%

Barium isotopes in individual presolar silicon carbide grains from the Murchison meteorite

Savina

Davis

Tripa

et al. 2003

Geochimica et Cosmochimica Acta

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Abstract-Barium isotopic compositions of single 2.3-5.3 m presolar SiC grains from the Murchison meteorite were measured by resonant ionization mass spectrometry. Mainstream SiC grains are enriched in s-process barium and show a spread in isotopic composition from solar to dominantly s-process. In the relatively coarse grain size fraction analyzed, there are large grain-to-grain variations of barium isotopic composition. Comparison of single grain data with models of nucleosynthesis in asymptotic giant branch (AGB) stars indicates that the grains most likely come from low mass carbon-rich AGB stars (1.5 to 3 solar masses) of about solar metallicity and with approximately solar initial proportions of r-and s-process isotopes. Measurements of single grains imply a wide variety of neutron-to-seed ratios, in agreement with previous measurements of strontium, zirconium and molybdenum isotopic compositions of single presolar SiC grains.

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Section: Ba Isotopes In Murchison Presolar Sic Grainsmentioning

confidence: 99%

Barium isotopes in individual presolar silicon carbide grains from the Murchison meteorite

Savina

Davis

Tripa

et al. 2003

Geochimica et Cosmochimica Acta

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“…Our experiments utilized facilities in the Materials Science Division at Argonne National Laboratory including an instrument known as CHARISMA (CHicago-Argonne Resonant Ionization Spectrometry for Micro-Analysis) [24,13] that will be described below. The instrumental setup is outlined, including the details of the laser cavities used for the excitation and ionization 1 of the isotopes of interest here.…”

Section: Chapter 3 Experimental Setup and Methodsmentioning

confidence: 99%

“…The instrument used to perform RIMS in these studies is known as the Chicago-Argonne Resonant Ionization Spectrometer for Microbeam Analysis (CHARSIMA) [24,13]. CHARISMA combines imaging capabilities (< 1 µm spatial resolution) with the ability to measure element concentrations below one part per billion (ng/g).…”

Section: Rimsmentioning

confidence: 99%

Quantifying Uranium Isotope Ratios Using Resonance Ionization Mass Spectrometry: The Influence of Laser Parameters on Relative Ionization Probability

Isselhardt

2011

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Resonance Ionization Mass Spectrometry (RIMS) has been developed as a method to measure relative uranium isotope abundances. In this approach, RIMS is used as an elementselective ionization process to provide a distinction between uranium atoms and potential isobars without the aid of chemical purification and separation. We explore the laser parameters critical to the ionization process and their effects on the measured isotope ratio. Specifically, the use of broad bandwidth lasers with automated feedback control of wavelength was applied to the measurement of 235 U/ 238 U ratios to decrease laser-induced isotopic fractionation. By broadening the bandwidth of the first laser in a 3-color, 3-photon ionization process from a bandwidth of 1.8 GHz to about 10 GHz , the variation in sequential relative isotope abundance measurements decreased from >10% to less than 0.5%. This procedure was demonstrated for the direct interrogation of uranium oxide targets with essentially no sample preparation. A rate equation model for predicting the relative ionization probability has been developed to study the effect of variation in laser parameters on the measured isotope ratio. This work demonstrates that RIMS can be used for the robust measurement of uranium isotope ratios. Professor Stanley G. Prussin Dissertation Committee Chair iThis dissertation is dedicated to all those who have invested in me, especially my wife and son who have given the most.ii

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“…The resonance ionization scheme used in these measurements was developed at ANL and is rather special. [5] Only two green lasers are needed to ionize Ti from its ground state (a3Fz) and a multiplet level of the ground state (a3FJ 170 cm" 1 above the ground state.…”

Section: Methodsmentioning

confidence: 99%

Impurity Characterization of Solar Wind Collectors for the Genesis Discovery Mission by Resonance Ionization Mass Spectrometry

1998

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NASA's Genesis Discovery Mission is designed to collect solar matter and return it to earth for analysis. The mission consists of launching a spacecraft that carries high purity collector materials, inserting the spacecraft into a halo orbit about the L1 sun-earth libration point, exposing the collectors to the solar wind for two years, and then returning the collectors to earth. The collectors will then be made available for analysis by various methods to determine the elemental and isotopic abundance of the solar wind. In preparation for this mission, potential collector materials are being characterized to determine baseline impurity levels and to assess detection limits for various analysis techniques. As part of the effort, potential solar wind collector materials have been analyzed using resonance ionization mass spectrometry (RIMS). RIMS is a particularly sensitivity variation of secondary neutral mass spectrometry that employs resonantly enhanced multiphoton ionization (REMPI) to selectively postionize an element of interest, and thus discriminates between low levels of that element and the bulk material. The high sensitivity and selectivity of RIMS allow detection of very low concentrations while consuming only small amounts of sample. Thus, RIMS is well suited for detection of many heavy elements in the solar wind, since metals heavier than Fe are expected to range in concentrations from 1 ppm to 0.2 ppt. In addition, RIMS will be able to determine concentration profiles as a function of depth for these implanted solar wind elements effectively separating them from terrestrial contaminants. RIMS analyses to determine Ti concentrations in Si and Ge samples have been measured. Results indicate that the detection limit for RIMS analysis of Ti is below 100 ppt for 106 averages. Background analyses of the mass spectra indicate that detection limits for heavier elements will be similar. Furthermore, detection limits near 1 ppt are possible with higher repetition rate lasers where it will be possible to increase signal averaging to 108 laser shots.

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New instrument for microbeam analysis incorporating submicron imaging and resonance ionization mass spectrometry

Cited by 51 publications

References 16 publications

Barium isotopes in individual presolar silicon carbide grains from the Murchison meteorite

Barium isotopes in individual presolar silicon carbide grains from the Murchison meteorite

Quantifying Uranium Isotope Ratios Using Resonance Ionization Mass Spectrometry: The Influence of Laser Parameters on Relative Ionization Probability

Impurity Characterization of Solar Wind Collectors for the Genesis Discovery Mission by Resonance Ionization Mass Spectrometry

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