Determination of Field Strength for Field Evaporation and Ionization in the Field Ion Microscope

1961 ◽  
Vol 32 (11) ◽  
pp. 2425-2428 ◽  
Author(s):  
Erwin W. Müller ◽  
Russell D. Young
Keyword(s):  
Field Strength ◽  
Field Evaporation ◽  
Field Ion Microscope

scholarly journals Slurry nebulisation ICP-MS direct determination of high field strength elements (Nb, Ta, Zr, and Hf) in silicate rocks

RSC Advances ◽  
2019 ◽  
Vol 9 (56) ◽  
pp. 32435-32440 ◽  
Author(s):  
Rui Tong ◽  
Wei Guo
Keyword(s):  
Field Strength ◽  
Inductively Coupled Plasma ◽  
High Field ◽  
Direct Determination ◽  
High Field Strength ◽  
Inductively Coupled ◽  
Icp Ms ◽  
Plasma Mass Spectrometry ◽  
Silicate Rocks

A simple, rapid, and reliable method based on slurry nebulisation inductively coupled plasma mass spectrometry (ICP-MS) was developed for the direct determination of four high field strength elements (HFSEs, namely, Nb, Ta, Zr, and Hf) in refractory silicate rocks.

scholarly journals Spatial Resolution in the Atom Probe Field Ion Microscope

1997 ◽  
Vol 3 (S2) ◽  
pp. 1189-1190
Author(s):  
M. K. Miller
Keyword(s):  
Spatial Resolution ◽  
Atom Probe ◽  
Single Atom ◽  
Field Evaporation ◽  
Sensitive Detector ◽  
Probe Field ◽  
3 Dimensional ◽  
Number Of Factors ◽  
The Individual ◽  
Field Ion Microscope

The atom probe field ion microscope can resolve and identify individual atoms. This ability is demonstrated in a pair of field ion micrographs of an Ni3Al specimen, Fig. 1, in which the individual atoms on the close packed (111) plane are clearly resolved. Comparison of these two micrographs reveals that an individual atom was field evaporated between the micrographs. Due to the hemispherical nature of the specimen, the ability to resolve this two dimensional atomic arrangement is only possible on low index plane facets. The spatial resolution in field ion images is determined by a number of factors including specimen temperature, material, microstructural features, specimen geometry, and crystallographic location.The spatial resolution of the data obtained in atom probe and 3 dimensional atom probe compositional analyses can be evaluated with the use of field evaporation or field desorption images. The field evaporation images are formed from the surface atoms with the use of a single atom sensitive detector whereas the field ion image is formed from the projection of a continuous supply of ionized image gas atoms.

AP-FIM INVESTIGATION OF THE INITIAL STAGE OF OXIDATION ON THE SURFACE OF ALLOYS

1995 ◽  
Vol 02 (02) ◽  
pp. 177-181 ◽  
Author(s):  
D.G. REN
Keyword(s):  
Binding Energy ◽  
Field Strength ◽  
Metal Atom ◽  
Exposure Period ◽  
Atom Probe ◽  
Field Evaporation ◽  
Residual Oxygen ◽  
Metal Atoms ◽  
Initial Stage ◽  
The Difference

This paper reports a study of the initial stage of oxidation on the surface of alloys by field-ion microscopy and atom probe (AP-FIM). The samples used in this investigation contained Ni, Ni-Cr, Ni-Al, Ti-Al , and Pt-Rh metals and alloys. A clean-tip surface, after atom-probe analysis, was exposed in the atmosphere of residual oxygen (vacuum 10−4 torr) for a few hours. AP analysis found that a small quantity of oxygen was adsorbed on the surface of the alloys. The clusters of a combination of a metal atom with an oxygen, i.e., PtO +2, NiO +2, and TiO +2 were determined by AP. The experiment found that the binding energy between metal atom on the surface of alloys was reduced when oxygen was adsorbed on the surface. The binding energy of surface atoms was determined according to the field strength of the tip surface. The reduction of the binding energy was about 0.5–2.0 eV, which changed following the exposure period in the atmosphere and depending on the kind of alloys used. The difference in field-ion image due to adsorption of oxygen was observed as compared to without the oxygen. The results of the experiment show that oxygen was absorbed on the “clean surface” of alloys. First the oxygen molecule was dissociated to oxygen atoms by the reaction with metal atoms and then formed the metal-oxygen bonding (M+O→MO) . This is an initial stage of oxidation on the surface of alloys. The clusters of combining oxygen did not dissociate during the field-evaporation process with 4.5 V/Å field strength.

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