Simplified method for the calibration of an atom-probe field-ion microscope

Alfred Wagner; Thomas M. Hall; David N. Seidman

doi:10.1063/1.1134386

Simplified method for the calibration of an atom-probe field-ion microscope

Alfred Wagner^*, Thomas M. Hall, David N. Seidman

^*Corresponding author for this work

Materials Science and Engineering

Research output: Contribution to journal › Article › peer-review

20 Scopus citations

Abstract

A simplified method for determining the mass-to-charge ratio of single pulse-field evaporated atoms in a time-of-flight (TOF), atom-probe, field-ion microscpoe (FIM) is described. The method is rather insensitive to the value of the pulse factor (α). This is achieved physically by making the pulse voltage a constant small fraction (f) of the steady-state imaging voltage, where f is much less than unity and is as small as possible to maximize the mass resolution. Examples of the W⁺³ and W⁺⁴ spectra of specimens pulse-field evaporated at ∼25 K in a background vacuum of 6×10^-10 Torr are presented. The W⁺³ spectrum exhibited very clearly the five naturally occurring isotopes (¹⁸⁰W, ¹⁸²W, ¹⁸³W, ¹⁸⁴W, and ¹⁸⁶W) with isotopic abundances that are in good agreement with the handbook values. The value of α chosen has only a very minor effect on the exact shape of the W⁺³ and W⁺⁴ spectra. The ratio of W⁺⁴ events to the total number of events (W⁺³ and W⁺⁴) is 0.17 for the (551) plane.

Original language	English (US)
Pages (from-to)	1032-1034
Number of pages	3
Journal	Review of Scientific Instruments
Volume	46
Issue number	8
DOIs	https://doi.org/10.1063/1.1134386
State	Published - 1975

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Instrumentation

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@article{d06378f0b07245a3935f1161ecb776d9,

title = "Simplified method for the calibration of an atom-probe field-ion microscope",

abstract = "A simplified method for determining the mass-to-charge ratio of single pulse-field evaporated atoms in a time-of-flight (TOF), atom-probe, field-ion microscpoe (FIM) is described. The method is rather insensitive to the value of the pulse factor (α). This is achieved physically by making the pulse voltage a constant small fraction (f) of the steady-state imaging voltage, where f is much less than unity and is as small as possible to maximize the mass resolution. Examples of the W+3 and W+4 spectra of specimens pulse-field evaporated at ∼25 K in a background vacuum of 6×10-10 Torr are presented. The W+3 spectrum exhibited very clearly the five naturally occurring isotopes (180W, 182W, 183W, 184W, and 186W) with isotopic abundances that are in good agreement with the handbook values. The value of α chosen has only a very minor effect on the exact shape of the W+3 and W+4 spectra. The ratio of W+4 events to the total number of events (W+3 and W+4) is 0.17 for the (551) plane.",

author = "Alfred Wagner and Hall, {Thomas M.} and Seidman, {David N.}",

year = "1975",

doi = "10.1063/1.1134386",

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T1 - Simplified method for the calibration of an atom-probe field-ion microscope

AU - Wagner, Alfred

AU - Hall, Thomas M.

AU - Seidman, David N.

PY - 1975

Y1 - 1975

N2 - A simplified method for determining the mass-to-charge ratio of single pulse-field evaporated atoms in a time-of-flight (TOF), atom-probe, field-ion microscpoe (FIM) is described. The method is rather insensitive to the value of the pulse factor (α). This is achieved physically by making the pulse voltage a constant small fraction (f) of the steady-state imaging voltage, where f is much less than unity and is as small as possible to maximize the mass resolution. Examples of the W+3 and W+4 spectra of specimens pulse-field evaporated at ∼25 K in a background vacuum of 6×10-10 Torr are presented. The W+3 spectrum exhibited very clearly the five naturally occurring isotopes (180W, 182W, 183W, 184W, and 186W) with isotopic abundances that are in good agreement with the handbook values. The value of α chosen has only a very minor effect on the exact shape of the W+3 and W+4 spectra. The ratio of W+4 events to the total number of events (W+3 and W+4) is 0.17 for the (551) plane.

AB - A simplified method for determining the mass-to-charge ratio of single pulse-field evaporated atoms in a time-of-flight (TOF), atom-probe, field-ion microscpoe (FIM) is described. The method is rather insensitive to the value of the pulse factor (α). This is achieved physically by making the pulse voltage a constant small fraction (f) of the steady-state imaging voltage, where f is much less than unity and is as small as possible to maximize the mass resolution. Examples of the W+3 and W+4 spectra of specimens pulse-field evaporated at ∼25 K in a background vacuum of 6×10-10 Torr are presented. The W+3 spectrum exhibited very clearly the five naturally occurring isotopes (180W, 182W, 183W, 184W, and 186W) with isotopic abundances that are in good agreement with the handbook values. The value of α chosen has only a very minor effect on the exact shape of the W+3 and W+4 spectra. The ratio of W+4 events to the total number of events (W+3 and W+4) is 0.17 for the (551) plane.

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Simplified method for the calibration of an atom-probe field-ion microscope

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