Download e-book for iPad: Atom Probe Tomography. Put Theory Into Practice by Williams Lefebvre, Francois Vurpillot, Xavier Sauvage

By Williams Lefebvre, Francois Vurpillot, Xavier Sauvage

ISBN-10: 0128046473

ISBN-13: 9780128046470

ISBN-10: 0128047453

ISBN-13: 9780128047453

Atom Probe Tomography is geared toward novices and researchers attracted to increasing their services during this sector. It offers the theoretical history and sensible info essential to examine how fabrics paintings utilizing atom probe microscopy concepts, and comprises specified motives of the basics, the instrumentation, modern specimen practise suggestions, and experimental info, in addition to an summary of the consequences that may be received. The booklet emphasizes procedures for assessing information caliber and the correct implementation of complex information mining algorithms.

For these more matured within the strategy, this ebook will function a unmarried complete resource of necessary reference info, tables, and methods. either newbie and professional will price the best way the publication is decided out within the context of fabrics technological know-how and engineering. furthermore, its references to key examine results dependent upon the learning software held on the college of Rouen-one of the major clinical learn facilities exploring a number of the points of the instrument-will extra increase figuring out and the training process.

  • Provides an creation to the services and barriers of atom probe tomography while reading materials
  • Written for either skilled researchers and new users
  • Includes routines, in addition to corrections, for clients to perform the thoughts discussed
  • Contains assurance of extra complex and not more common options, akin to correlative APT and STEM microscopy

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Additional resources for Atom Probe Tomography. Put Theory Into Practice

Example text

12 Threshold field of postionization of several singly ionized atoms (B, C, O, Mg, Al, Si, Zr, Ag, Cr, Fe, Ni, Cu, N) as a function of the second ionization energy I2 (in electron volts). These threshold fields are compared to experimental best image fields for noble gas. 735, close to the I3/2 trend). 38 F. Vurpillot the field ionization theory. The threshold field of postionization principally depends on the ionization energy of the considered element, with a trend close to the power 3/2 of I with an excellent agreement with most of the experimental data even if a lot of approximations exist in the calculation.

Pulsed-Field Evaporation The controlled emission of evaporated atoms is mandatory in AP to perform time-of-flight mass spectrometry. Pulsed FEV can be achieved through two main mechanisms, voltage pulsing and thermal pulsing. Voltage-Pulsed Evaporation Let us consider a material with evaporation constants C and FEV, submitted to a base temperature T0. Under the application of VDC, a standing field FDC exists at the atom surface. We can choose this field to avoid any significant evaporation of atoms (KT ( 1 atom/s).

These partial ions feel the positive field, and are submitted to a Maxwell stress as described in Eq. 4). This stress can be sufficient to pull out the atom from the surface, the atom being more exposed to the applied field, and complete ionization being possible at a given point. Once being ionized, the particle leaves the surface freely. This approach was proposed by McMullen, Perdew, and Rose to interpret the complete FEV of an Al-atom layer modeled with a 1D DFT approach [46,50]. The self-consistent quantum calculation, which models the fundamental state of the electron density when moving a surface ion core slab outward a surface submitted to different applied fields, demonstrates the existence of an energy barrier, very similar to the historical representation of M€ uller that has to be crossed by the atom to become ionic.

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Atom Probe Tomography. Put Theory Into Practice by Williams Lefebvre, Francois Vurpillot, Xavier Sauvage


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