Role of Photoexcitation and Field Ionization in the Measurement of Accurate Oxide Stoichiometry by Laser-Assisted Atom Probe Tomography
Journal Article
·
· The Journal of Physical Chemistry Letters, 4(6):993-998
Pulsed lasers extend the high spatial and mass resolution of atom probe tomography (APT) to non-conducting materials, such as oxides. For prototypical metal oxide MgO, measured stoichiometry depends strongly upon pulse energy and applied voltage. Very low laser energies (0.02 pJ) and high electric fields yield optimal stoichiometric accuracy, attributed to the field-dependent ionization of photo-desorbed O or O2 neutrals. This emphasizes the importance of considering electronic excitations in APT analysis of oxides ionic materials.
- Research Organization:
- Pacific Northwest National Laboratory (PNNL), Richland, WA (US), Environmental Molecular Sciences Laboratory (EMSL)
- Sponsoring Organization:
- USDOE
- DOE Contract Number:
- AC05-76RL01830
- OSTI ID:
- 1072848
- Report Number(s):
- PNNL-SA-92674; 46696; KP1704020
- Journal Information:
- The Journal of Physical Chemistry Letters, 4(6):993-998, Journal Name: The Journal of Physical Chemistry Letters, 4(6):993-998
- Country of Publication:
- United States
- Language:
- English
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