The atom probe is a microscope used in material science that was invented in 1967 by Erwin Wilhelm Müller, J. A. Panitz, and S. Brooks McLane. The atom probe is closely related to the method of Field Ion Microscopy, which is the first microscopic method to achieve atomic resolution, occurring in 1951.
Atom probes are unlike conventional optical or electron microscopes, in that the magnification effect comes from the magnification provided by a highly curved electric field, rather than by the manipulation of radiation paths. Technically, the method is destructive in nature removing ions from a sample surface in order to image and identify them, generating magnifications sufficient to observe individual atoms as they are removed from the sample surface. Through coupling of this magnification method with time of flight mass spectrometry, ions evaporated by application of electric pulses can have their mass-to-charge ratio computed.
Through successive evaporation of material, layers of atoms are removed from a specimen, allowing for probing not only of the surface, but also through the material itself. Computer methods are utilised to rebuild a three dimensional view of the sample, prior to it being evaporated, providing atomic scale information on the structure of a sample, as well as providing the type atomic species information. The instrument allows the three-dimensional reconstruction of up to hundreds of millions of atoms from a sharp tip (corresponding to specimen volumes of 10,000-1,000,000 nm3).
... Panitz is the co-inventor of the Atom-Probe Field Ion Microscope and the inventor of the 10-cm atom-probe, the Imaging Atom-Probe, the LIFE detector (a ... The 10-cm Atom-Probe and the Imaging Atom-Probe are the progenitors of all later atom probe instruments including the commercial instruments available today ...
... An atom probe is an instrument that combines time-of-flight mass spectrometry and field ion microscopy (FIM) to map the location of individual atoms ...
Famous quotes containing the words probe and/or atom:
“Yknow scientists are funny. We probe and measure and dissect. Invent lights without heat, weigh a caterpillars eyebrow. But when it comes to really important things were as stupid as the caveman.... Like love. Makes the world go round, but what do we know about it? Is it a fact? Is it chemistry? Electricity?”
—Martin Berkeley, and Jack Arnold. Helen Dobson (Lori Nelson)
“We have grasped the mystery of the atom and rejected the Sermon on the Mount.... The world has achieved brilliance without wisdom, power without conscience. Ours is a world of nuclear giants and ethical infants.”
—Omar Bradley (18931981)