scholarly journals Doubly- and Triply- Charged Diatomic Molybdenum Cluster Ions As Observed in Pulsed-Laser Assisted Local-Electrode Atom-Probe (LEAPTM) Tomography

2007 ◽  
Vol 13 (S02) ◽  
Author(s):  
D Isheim ◽  
DN Seidman ◽  
N Wanderka
Keyword(s):  
Pulsed Laser ◽  
Atom Probe ◽  
Cluster Ions ◽  
Molybdenum Cluster

PULSED-LASER ATOM-PROBE STUDY OF Al-GaAs INTERFACES

1986 ◽  
Vol 47 (C7) ◽  
pp. C7-303-C7-308
Author(s):  
O. NISHIKAWA ◽  
M. YANAGISAWA ◽  
M. NAGAI
Keyword(s):  
Pulsed Laser ◽  
Atom Probe

On the Field Evaporation Behavior of a Model Ni-Al-Cr Superalloy Studied by Picosecond Pulsed-Laser Atom-Probe Tomography

2008 ◽  
Vol 14 (6) ◽  
pp. 571-580 ◽  
Author(s):  
Yang Zhou ◽  
Christopher Booth-Morrison ◽  
David N. Seidman
Keyword(s):  
Atom Probe Tomography ◽  
Mass Spectra ◽  
Pulsed Laser ◽  
Picosecond Laser ◽  
Atom Probe ◽  
Resolving Power ◽  
Noise Levels ◽  
Thermally Activated ◽  
Mass Resolving Power

AbstractThe effects of varying the pulse energy of a picosecond laser used in the pulsed-laser atom-probe (PLAP) tomography of an as-quenched Ni-6.5 Al-9.5 Cr at.% alloy are assessed based on the quality of the mass spectra and the compositional accuracy of the technique. Compared to pulsed-voltage atom-probe tomography, PLAP tomography improves mass resolving power, decreases noise levels, and improves compositional accuracy. Experimental evidence suggests that Ni2+, Al2+, and Cr2+ ions are formed primarily by a thermally activated evaporation process, and not by post-ionization of the ions in the 1+ charge state. An analysis of the detected noise levels reveals that for properly chosen instrument parameters, there is no significant steady-state heating of the Ni-6.5 Al-9.5 Cr at.% tips during PLAP tomography.

Interfacial chemistry in an InAs/GaSb superlattice studied by pulsed laser atom probe tomography

2012 ◽  
Vol 100 (8) ◽  
pp. 083109 ◽  
Author(s):  
M. Müller ◽  
B. Gault ◽  
M. Field ◽  
G. J. Sullivan ◽  
G. D. W. Smith ◽  
...  
Keyword(s):  
Atom Probe Tomography ◽  
Pulsed Laser ◽  
Atom Probe ◽  
Interfacial Chemistry

Investigation of Performance-Influencing Factors in Pulsed Laser Atom Probe

2008 ◽  
Vol 14 (S2) ◽  
pp. 1238-1239 ◽  
Author(s):  
JH Bunton ◽  
JD Olson ◽  
DR Lenz ◽  
TF Kelly
Keyword(s):  
New Mexico ◽  
Influencing Factors ◽  
Pulsed Laser ◽  
Atom Probe ◽  
Performance Influencing Factors

Extended abstract of a paper presented at Microscopy and Microanalysis 2008 in Albuquerque, New Mexico, USA, August 3 – August 7, 2008

Study on Quantitative Analysis of Carbon and Nitrogen in Stoichiometric θ-Fe3C and γ′-Fe4N by Atom Probe Tomography

2020 ◽  
Vol 26 (2) ◽  
pp. 185-193
Author(s):  
Jun Takahashi ◽  
Kazuto Kawakami ◽  
Yukiko Kobayashi
Keyword(s):  
Quantitative Analysis ◽  
Nitrogen Concentration ◽  
Pulsed Laser ◽  
Atom Probe ◽  
Carbon And Nitrogen ◽  
Atom Probes ◽  
Charge Spectrum ◽  
Preferential Evaporation ◽  
The Mean ◽  
Pulsed Voltage

AbstractThe quantitative analysis performance of carbon and nitrogen was investigated using stoichiometric θ-Fe3C (25 at% C) and γ′-Fe4N (~20 at% N) precipitates in pulsed voltage and pulsed laser atom probes. The dependencies of specimen temperature, pulse fraction, and laser pulse energy on the apparent concentrations of carbon and nitrogen were measured. Good coincidence with 25 at% carbon concentration in θ-Fe3C was obtained for the pulsed voltage atom probe by considering the mean number of carbon atoms per ion at 24 Da and the detection loss of iron, while better coincidence was obtained for the pulsed laser atom probe by considering only the mean number of carbon at 24 Da. On the other hand, a lack of nitrogen concentration in γ′-Fe4N was observed for the two atom probes. In particular, the pulsed laser atom probe showed a significant lack of nitrogen concentration. This implies that a large amount of 14N2+ was obscured by the main iron peak of 56Fe2+ at 28 Da in the mass-to-charge spectrum. Regarding preferential evaporation or retention, carbon in θ-Fe3C exhibited little of either, but nitrogen in γ′-Fe4N exhibited definite preferential retention. This result can be explained by the large difference in ionization energy between carbon and nitrogen.

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