Laser-Assisted Field Evaporation of Chromia with Deep Ultraviolet Laser Light.

IF 2.9 4区 工程技术 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY Microscopy and Microanalysis Pub Date : 2025-02-17 DOI:10.1093/mam/ozae111
Severin Jakob, Andrea Fazi, Mattias Thuvander
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Abstract

In this work, samples of chromia (Cr2O3) scale have been prepared for atom probe tomography and field evaporated with deep ultraviolet laser light (258 nm wavelength). The investigated range of laser energies spans more than three orders of magnitude between 0.03 and 90 pJ. Furthermore, the effects of detection rate and temperature were investigated. Simultaneous voltage and laser pulses were employed on additional needle specimens to reduce the standing voltage and minimize background noise during the measurement. Smooth evaporation with minimal mass spectrum peak tails was maintained over the whole range of measurement parameters. High laser energies result in significant underestimation of the oxygen content. Only laser energies below 1 pJ resulted in measured values near the expected oxygen content of 60 at%, the closest being about 58 at%.

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利用深紫外激光对铬金属进行激光辅助场蒸发。
在这项工作中,为原子探针层析技术制备了铬(Cr2O3)鳞片样品,并用深紫外激光(波长 258 纳米)进行了场蒸发。所研究的激光能量范围在 0.03 至 90 pJ 之间,跨度超过三个数量级。此外,还研究了检测率和温度的影响。在额外的针状试样上同时使用了电压和激光脉冲,以降低驻留电压并将测量过程中的背景噪声降至最低。在整个测量参数范围内,都保持了平稳的蒸发和最小的质谱峰尾。高激光能量会导致氧含量被严重低估。只有低于 1 pJ 的激光能量才会导致测量值接近 60 at% 的预期氧含量,最接近的氧含量约为 58 at%。
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来源期刊
Microscopy and Microanalysis
Microscopy and Microanalysis 工程技术-材料科学:综合
CiteScore
1.10
自引率
10.70%
发文量
1391
审稿时长
6 months
期刊介绍: Microscopy and Microanalysis publishes original research papers in the fields of microscopy, imaging, and compositional analysis. This distinguished international forum is intended for microscopists in both biology and materials science. The journal provides significant articles that describe new and existing techniques and instrumentation, as well as the applications of these to the imaging and analysis of microstructure. Microscopy and Microanalysis also includes review articles, letters to the editor, and book reviews.
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