An atom probe for three-dimensional tomography
Article Abstract:
An atom probe for three-dimensional tomography of field-induced evaporation of ions from a needle-like surface resulted in the identification of the ions by time-of-flight mass spectrometry. The determination of quantitative material composition in a small selected area of the surface with single-layer-resolution is revealed by the atom-probe technique. Atomic-resolution images of surfaces are produced by the field-ion microscope. Although efforts were made to combine the field-ion microscope technique and atom-probe technique, they could not identify all chemical species or combine special and temporal information for multiple events.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 1993
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Evidence for deep mantle circulation from global tomography
Article Abstract:
Seismic tomography research using P-wave travel times indicates mantle-wide convective flow exists. Body wave analysis identifies the exact position of lower mantle structures at Earth surface sites all over the world. Inverted travel times from P-waves provide a picture of aspherical variations in compressional wave speed within the Earth's mantle.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 1997
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Electrons frozen in motion
Article Abstract:
The three dimensional shape of a person's innards is derived from a series of two-dimensional X-ray images recorded at different angles in a medical tomography. The tomographic reconstruction is based on a series of images of the orbital shadow in different directions.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 2004
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