Time evolution of positron affinity trapping at embedded nanoparticles by age-momentum correlation
Time evolution of positron affinity trapping at embedded nanoparticles by age-momentum correlation
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DOI：
10.1103/physrevb.83.115459
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发表时间：
2011-03
影响因子：
3.7
通讯作者：
K. Inoue;Y. Nagai;Z. Tang;T. Toyama;Y. Hosoda;A. Tsuto;M. Hasegawa
中科院分区：
文献类型：
--
作者：
K. Inoue;Y. Nagai;Z. Tang;T. Toyama;Y. Hosoda;A. Tsuto;M. Hasegawa
正电子湮没年龄-动量相关（AMOC）技术，使用数字示波器具有高的时间分辨率，使我们能够直接估计正电子捕获率纳米和亚纳米粒子嵌入材料通过观察湮没时间演化的动量分布的亲和力捕获的正电子-电子对。作为一个有代表性的情况下，我们成功地应用本技术的（亚）纳米铜颗粒嵌入在热老化后的Fe-Cu稀合金。这增强了正电子湮没方法作为定量工具来检测难以通过其他技术观察的超细嵌入颗粒的能力。我们还表明，AMOC测量通过正电子捕获动力学行为给出了嵌入粒子的化学信息。
A positron annihilation age-momentum correlation (AMOC) technique using a digital oscilloscope with high time resolution enabled us to directly estimate positron trapping rate to nano- and subnanoparticles embedded in materials by observing the annihilation time evolution of the momentum distribution of affinity-trapped positron-electron pairs. As a representative case we successfully apply the present technique to (sub)nano Cu particles embedded in an Fe-Cu dilute alloy after thermal aging. This enhances the ability of the positron annihilation method as a quantitative tool to detect ultrafine embedded particles which are difficult to observe by other techniques. We also show that the AMOC measurements give chemical information on the embedded particles through the positron trapping kinetic behavior.