摘要
本文利用正电子湮没谱(PAS)研究两种非金晶态聚合物PMMA和Epoxy中正电子素(Ps)在外磁场中(0至25KG)的猝灭行为。现察到沿外磁场方向自旋为零的o-Ps(m=0)态和p-Ps(m=0)态在磁场中混合态的生成。由测得的寿命谱得到混合参数α,进而求出PMMA和Epoxy在外磁场中Ps能级的超精细分裂△E和描述介质影响的参数η。
Magnetic field quenching of positronium (Ps) has been studied in PMMA and Epoxy polymers using in the positron lifetime spectroscopy. The mixing state of ortho-positronium o-Ps (m=0) state and para-positronium p-Ps(m=0) state in the field rang 0-25KG was observed. We have been obtained the zero-field hypefine splitting of positronium 'ΔE' by the mixing parameter 'a'. The 'a' is determined by the annihilation rates of the positronium.
