The shape of field-ion emitters

Webber, Ruth; Walls, John M.

doi:10.1088/0022-3727/12/9/021

Cited by 10 publications

(5 citation statements)

References 14 publications

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“…along the $1 1 1% direction enable to obtain average information along these directions. and field conditions~Drechsler & Wolf, 1958;Webber et al, 1979;Drechsler, 1992!. This shaping requires atoms to be field evaporated, and we assumed that the first million atoms collected in each condition might not reflect the actual shape of the specimen, but a transient state during which the specimen is in an out-of-equilibrium state.…”

Section: Methodsmentioning

confidence: 99%

“…For each experiment, between 2 and 7 million atoms were collected to ensure statistics, and to make sure the specimen is studied in an equilibrium state. Indeed, it is known that the specimen shape evolves to accommodate the temperature and field conditions (Drechsler, 1992 ;Drechsler & Wolf, 1958;Webber, et al, 1979). This shaping requires atoms to be field evaporated, and we assumed that the first million of atoms collected in each condition might not reflect the actual shape of the specimen, but a transient state during which the specimen is…”

Section: Methodsmentioning

confidence: 99%

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Spatial Resolution in Atom Probe Tomography

et al. 2010

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This article addresses gaps in definitions and a lack of standard measurement techniques to assess the spatial resolution in atom probe tomography. This resolution is known to be anisotropic, being better in the depth than laterally. Generally the presence of atomic planes in the tomographic reconstruction is considered as being a sufficient proof of the quality of the spatial resolution of the instrument. Based on advanced spatial distribution maps, an analysis methodology that interrogates the local neighborhood of the atoms within the tomographic reconstruction, it is shown how both the in-depth and the lateral resolution can be quantified. The influences of the crystallography and the temperature are investigated, and models are proposed to explain the observed results. We demonstrate that the absolute value of resolution is specimenspecific. 2/23

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Spatial Resolution in Atom Probe Tomography

et al. 2010

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“…To determine local radii of curvature, methods based on ring counting in field-ion microscopy (FIM) images had often been used [35][36][37]. It was recently proposed to apply a similar methodology to field desorption images [21].…”

Section: Evolution Of Specimen Shapementioning

confidence: 99%

Impact of laser pulsing on the reconstruction in an atom probe tomography

et al. 2010

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“…This observation is consistent with experimental observations. It is indeed well known that, in pure metals, tips are faceted ( Drechsler & Wolf, 1960; Webber et al ., 1979 ; Drechsler, 1992).…”

Section: The Steady State Shape Of the Emittermentioning

confidence: 99%

The shape of field emitters and the ion trajectories in three‐dimensional atom probes

Vurpillot

Bostel

Blavette

1999

Journal of Microscopy

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The lateral resolution of three-dimensional atom probes is mainly controlled by the aberrations of the ion trajectories near the specimen surface. For the first time, a simulation program has been developed to reconstruct the ion trajectories near a sharp hemispherical electrode defined at the atomic scale. Surface atoms submitted to the highest field were removed one by one. The consecutive gradual change of the surface topology was taken into account in the calculation of ion trajectories. As the tip was 'field evaporated', the initial spherical shape of the emitter was observed to transform gradually into a polygonal shape. When the tip reached its equilibrium shape, the field distribution at the tip surface was found to be much more uniform compared to the initial distribution. The calculated distribution of ion impacts on the detector exhibits the presence of depleted zones both at the centre of low index poles and along <001> zone axes. These predictions are in excellent agreement with experiments.

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The shape of field-ion emitters

Cited by 10 publications

References 14 publications

Spatial Resolution in Atom Probe Tomography

Spatial Resolution in Atom Probe Tomography

Impact of laser pulsing on the reconstruction in an atom probe tomography

The shape of field emitters and the ion trajectories in three‐dimensional atom probes

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