1. Oxygen isotopic measurements on the Cameca Nanosims 50
- Author
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Slodzian, G., Hillion, F., Stadermann, F.J., and Horreard, F.
- Subjects
- *
OXYGEN isotopes , *SECONDARY ion mass spectrometry , *PHOTOMULTIPLIERS - Abstract
The Cameca Nanosims 50 has been designed to provide for parallel detection along a focal plane over a large mass range but spacing between adjacent mass lines makes it necessary to use miniature electron multipliers (EMs). A new version of a miniature EM, designed to reduce aging effects, has been tested. Means to characterize aging effects are presented. Data are interpreted by simulations with a simple model. Consequences of aging on isotopic measurements in a parallel detection context are examined in the special case of oxygen. Measurements of the most abundant isotope with a Faraday cup (FC) and weak isotopes with EMs are reported. Advantages of FC are emphasized: no dead time correction and no quasi-simultaneous arrivals to account for in a situation where high collection efficiencies (8% for O− for instance) leads to large corrections. [Copyright &y& Elsevier]
- Published
- 2003
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