Materials applications of an advanced 3-dimensional atom probe

Cerezo, A., Gibuoin, D., Sijbrandij, SJ., Venker, FM., Warren, PJ., Wilde, J. & Smith, GDW., Sep-1996, In : Journal de Physique IV. 6, C5, p. 205-210 6 p.

Research output: Contribution to journalArticleAcademicpeer-review

  • A Cerezo
  • D Gibuoin
  • SJ Sijbrandij
  • FM Venker
  • PJ Warren
  • J Wilde
  • GDW Smith

An advanced 3-dimensional atom probe system has been constructed, based on an optical position-sensitive atom probe (OPoSAP) detector with energy compensation using a reflectron lens. The multi-hit detection capability of the OPoSAP lends to significant improvements in the efficiency of the instrument over the earlier serial position-sensing system. Further gains in efficiency are obtained by using a biassed grid in front of the detector to collect secondary electrons generated when ions strike the interchannel area. The improvement in detection efficiency gives enhanced performance in the studies of ordered materials and the determination of site occupation. Energy compensation leads to a much improved mass resolution (m/Delta m=500 full width at half maximum) making it possible to map out the 3-dimensional spatial distributions of all the elements in complex engineering alloys, even when elements lie close together in the mass spectrum. For example, in the analysis of a maraging steel, this allows separation between the Ni-61(2+) and Mo-92(3+) peaks, which are only 1/6 of a mass unit apart.

Original languageEnglish
Pages (from-to)205-210
Number of pages6
JournalJournal de Physique IV
Issue numberC5
Publication statusPublished - Sep-1996
Event43rd International Field Emission Symposium (IFES96) -
Duration: 14-Jul-199619-Jul-1996


43rd International Field Emission Symposium (IFES96)


Event: Other



ID: 6494979