Simultaneous dual-element analyses of refractory metals in naturally occurring matrices using resonance ionization of sputtered atoms
- Materials Science and Chemical Technology Divisions, Argonne National Laboratory, Argonne, Illinois 60439 (United States)
- Division of Geological and Planetary Sciences, California Institute of Technology, Pasadena, California 91125 (United States)
- Materials Science and Chemistry Divisions, Argonne National Laboratory, Argonne, Illinois 60439 (United States)
The combination of secondary neutral mass spectrometry (SNMS) and resonance ionization spectroscopy (RIS) has been shown to be a powerful tool for the detection of low levels of elemental impurities in solids. Drawbacks of the technique have been the laser-repetition-rate-limited, low duty cycle of the analysis and the fact that RIS schemes are limited to determinations of a single element. These problems have been addressed as part of an ongoing program to explore the usefulness of RIS/SNMS instruments for the analysis of naturally occurring samples. Efficient two-color, two-photon (1+1) resonance ionization schemes were identified for Mo and for four platinum-group elements (Ru, Os, Ir, and Re). Careful selection of the ionization schemes allowed Mo or Ru to be measured simultaneously with Re, Os, or Ir, using two tunable dye lasers and an XeCl excimer laser. Resonance frequencies could be switched easily under computer control, so that all five elements can be rapidly analyzed. {ital In} {ital situ} measurements of these elements in metal grains from five meteorites were conducted. From the analyses, estimates of the precision and the detection limit of the instrument were made. The trade-off between lower detection limits and rapid multielement RIS analyses is discussed. {copyright} {ital 1995} {ital American} {ital Vacuum} {ital Society}
- DOE Contract Number:
- W-31-109-ENG-38
- OSTI ID:
- 64951
- Journal Information:
- Journal of Vacuum Science and Technology, A, Vol. 13, Issue 3; Other Information: PBD: May 1995
- Country of Publication:
- United States
- Language:
- English
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