Positron and Positronium Annihilation in Polymers Studied by Age-Momentum Correlation Spectroscopy
Positron and Positronium Annihilation in Polymers Studied by Age-Momentum Correlation Spectroscopy
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DOI：
10.12693/aphyspola.113.1511
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发表时间：
2008-05
影响因子：
0.7
通讯作者：
Kiminori Sato;H. Murakami;K. Ito;K. Hirata;Y. Kobayashi
中科院分区：
文献类型：
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作者：
Kiminori Sato;H. Murakami;K. Ito;K. Hirata;Y. Kobayashi
利用正电子年龄-动量相关谱研究了聚合物中正电子(e)和正电子离子（Ps）的湮灭过程，该谱能灵敏地探测e、p-Ps和o-Ps的动量分布。对于聚醚砜和乙烯四氟乙烯共聚物，分别属于含氧聚合物（O族）和含氟聚合物（F族），观察到极性元素对正电子捕获的显著影响。o-Ps拾取湮灭的多普勒谱受到F原子的强烈影响，引起异常展宽。为了探讨年龄-动量相关光谱在自由体积周围进行化学分析的可行性，我们将这些结果与我们之前的S - I3相关数据进行了讨论。
Positron (e) and positronium (Ps) annihilation processes in polymers are studied by positron age-momentum correlation spectroscopy, which can sensitively probe momentum distributions of e, p-Ps, and o-Ps. For polyether sulfone and ethylene tetrafluoroethylene copolymer belonging to oxygen-containing polymers (O group) and fluorine-containing polymers (F group), respectively, significant effects of positron trapping by polar element are observed. The Doppler profile of o-Ps pick-off annihilation is strongly influenced by F atoms, giving rise to anomalous broadening. The results are discussed together with our previous data of the S−I3 correlation in order to explore the feasibility of chemical analysis around the free volumes by age-momentum correlation spectroscopy.