Measurements of field enhancement introduced by a local electrode

Direct measurements of field enhancement introduced by a local electrode ha ve been carried out on a scanning atom probe (SAP). The results show that a n enhancement factor of more than 2 can be obtained simply by reducing the specimen-to-electrode distance from 1.5 mm to 10 mum. Further enhancement c an be achieved if the electrode has a smaller aperture, This suggests that a specimen with tip radius of similar to 200 nm, which usually is too blunt to be analysed in a standard atom probe, could now be analysed by SAP. The capability of analysing blunt tips will expand the applicability of SAP to a much broader range of materials. (C) 2001 Elsevier Science B.V. All righ ts reserved.