Trace, isotopic analysis of micron-sized grains -- Mo, Zr analysis of stardust (SiC and graphite grains).

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Secondary Neutral Mass Spectrometry using resonant laser ionization can provide for both high useful yields and high discrimination while maintaining high lateral and depth resolutions. An example of the power of the method is measurement of the isotopic composition of Mo and Zr in 1-5 {micro}m presolar SiC and graphite grains isolated from the Murchison CM2 meteorite for the first time. These grains have survived the formation of the Solar System and isotopic analysis reveals a record of the stellar nucleosynthesis present during their formation. Mo and Zr, though present at less than 10 ppm in some grains, are particularly ... continued below

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11 p.

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Pellin, M. J. & Nicolussi, G. K. February 19, 1998.

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Secondary Neutral Mass Spectrometry using resonant laser ionization can provide for both high useful yields and high discrimination while maintaining high lateral and depth resolutions. An example of the power of the method is measurement of the isotopic composition of Mo and Zr in 1-5 {micro}m presolar SiC and graphite grains isolated from the Murchison CM2 meteorite for the first time. These grains have survived the formation of the Solar System and isotopic analysis reveals a record of the stellar nucleosynthesis present during their formation. Mo and Zr, though present at less than 10 ppm in some grains, are particularly useful in that among their isotopes are members that can only be formed by distinct nucleosynthetic processes known as s-, p-, and r-process. Successful isotopic analysis of these elements requires both high selectivity (since these are trace elements) and high efficiency (since the total number of atoms available are limited). Resonant Ionization Spectroscopy is particularly useful and flexible in this application. While the sensitivity of this t.edmique has often been reported in the past, we focus hereon the very low noise properties of the technique. We further demonstrate the efficacy of noise removal by two complimentary methods. First we use the resonant nature of the signal to subtract background signal. Second we demonstrate that by choosing the appropriate resonance scheme background can often be dramatically reduced.

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11 p.

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OSTI as DE00008139

Medium: P; Size: 11 pages

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  • Symposium on ''Advanced Optical Methods for Ultrasensitive Detection'', San Jose, CA (US), 01/24/1998--01/30/1998

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  • Report No.: ANL/CHM/CP-94712
  • Grant Number: W-31-109-ENG-38
  • Office of Scientific & Technical Information Report Number: 8139
  • Archival Resource Key: ark:/67531/metadc739079

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Office of Scientific & Technical Information Technical Reports

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  • February 19, 1998

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  • Oct. 18, 2015, 6:40 p.m.

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  • April 6, 2017, 7:47 p.m.

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Pellin, M. J. & Nicolussi, G. K. Trace, isotopic analysis of micron-sized grains -- Mo, Zr analysis of stardust (SiC and graphite grains)., article, February 19, 1998; Illinois. (digital.library.unt.edu/ark:/67531/metadc739079/: accessed September 25, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.