【摘要】 本工作研究了溶解在六氟苯（C₆F₆）中的氧对正子素（Ps）寿命的影响。分别得到了在C₆F₆中三重态正电子素（O-Ps）的原始摘除寿命τ₃⁰=4.15 ns;氧猝灭O-Ps的速率常数k_O2=1.8×10¹⁰(1mol^-1s^-1);三重态激发分子³（C₆F₆）猝灭O-Ps的速率常数k³（C₆F₆）=1.7×10¹⁰(1mol^-1s^-1),以及六氟苯体系中三重态激发分子³（C₆F₆）猝灭O-Ps的贡献。结果表明:³（C₆F₆）对O-Ps寿命的影响并不很大。更多还原

【Abstract】 Under examination of the effect of oxygen on the lifetime（τ₃） ofortho-positronium （O-Ps） in perfluorobenzene system, it is found that the effect ofoxygen on τ₃ in C₆F₆ is not marked when Po₂ is less than 9.3×10³ Pa, but the τ₃is decreased markedly as Po₂ increases. The experimental results show that the effectof excited molecule ³（C₆F₆） on the τ₃ of O-Ps is small. The kinetic calculation has been performed. The results demonstrate that the fol-lowing reactions take place in above system:C₆F₆+O-Ps→C₆F₆+P-Ps³（C₆F₆）^*+O-Ps→¹（C₆F₆）^*+P-Ps³O₂+O-Ps→¹O₂+P-Ps³O₂+³（C₆F₆）^*→¹（C₆F₆）^*+¹O₃^*hv²O₃ The values of the original pick-off lifetime（τ₈⁰） of O-Ps, K（³O₂+O-Ps）, andK（³（C₆F₆）^*+O-Ps）have been evaluated, 4. 15ns, 1. 8×10¹⁰(1·mol^-1·s^-1) and 1. 7×10¹⁰(1. mol^-1·s^-1), respectively.更多还原