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Oxygen isotopic measurements on the Cameca Nanosims 50
- Source :
-
Applied Surface Science . Jan2003, Vol. 203/204, p798. 4p. - Publication Year :
- 2003
-
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]
- Subjects :
- *OXYGEN isotopes
*SECONDARY ion mass spectrometry
*PHOTOMULTIPLIERS
Subjects
Details
- Language :
- English
- ISSN :
- 01694332
- Volume :
- 203/204
- Database :
- Academic Search Index
- Journal :
- Applied Surface Science
- Publication Type :
- Academic Journal
- Accession number :
- 8794008
- Full Text :
- https://doi.org/10.1016/S0169-4332(02)00826-7