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Positron annihilation lifetime of irradiated polyimide

机译：辐照聚酰亚胺的正电子an灭寿命

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摘要

Ortho-positronium pick off annihilation lifetime gives the information of the microscopic free volume of polymers. Polyimide polymers such as Kapton are applied in many fields, but it was impossible to apply the positron lifetime method for free volume investigation because of no positronium formation. Here, we apply the idea of the free positron annihilation probability that is sum of the probability of annihilation by the positron and electrons on the molecular chain where the positron localized and that for the annihilation with the electrons on the neighboring molecular chains. The second term is probably affected by the free volume change. We have successfully shown the temperature dependence and the electron beam irradiation effect on the free volume change by observing the free positron annihilation lifetime for Kapton.
机译：邻位正电子pick灭寿命给出了聚合物微观自由体积的信息。聚酰亚胺聚合物（例如Kapton）已应用于许多领域，但是由于没有形成正电子，因此不可能将正电子寿命方法用于自由体积研究。在这里，我们采用自由正电子an灭概率的概念，该概率是由正电子和分子在正电子所处的分子链上的电子and灭的概率以及与在相邻分子链上的电子的ni灭的概率之和。第二项可能受到自由音量变化的影响。通过观察Kapton的自由正电子an灭寿命，我们成功地显示了温度和电子束辐照对自由体积变化的影响。

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  • 来源
  • 会议地点 Smolenice Castle(SK)
  • 作者

    Tetsuya Hirade; Toshitaka Oka; Norio Morishita; Akira Idesaki; Akihiko Shimada;

  • 作者单位

    Nuclear Science and Engineering Directorate, Japan Atomic Energy Agency, Tokai, Naka, Ibaraki 319-1195, Japan,Graduate School of Science and Engineering, Ibaraki University, 4-12-1 Narusawa, Hitachi, Ibaraki, 316-8511 Japan;

    Advanced Science Research Center, Japan Atomic Energy Agency, Tokai, Naka, Ibaraki 319-1195 Japan;

    Quantum Beam Science Directorate, Japan Atomic Energy Agency, 1233 Watanuki-machi, Takasaki, Gunma, 370-1292, Japan;

    Quantum Beam Science Directorate, Japan Atomic Energy Agency, 1233 Watanuki-machi, Takasaki, Gunma, 370-1292, Japan;

    Quantum Beam Science Directorate, Japan Atomic Energy Agency, 1233 Watanuki-machi, Takasaki, Gunma, 370-1292, Japan;

  • 会议组织
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    positron; lifetime; polyimide; Kapton; free volume; electron irradiation; temperatures;

    机译：正电子一生;聚酰亚胺卡普顿自由体积；电子辐照温度;

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