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本工作研究了溶解在六氟苯(C_6F_6)中的氧对正子素(Ps)寿命的影响。分别得到了在C_6F_6中三重态正电子素(O-Ps)的原始摘除寿命τ_3~0=4.15 ns;氧猝灭O-Ps的速率常数k_(O_2)=1.8×10~(10)(1mol~(-1)s~(-1));三重态激发分子~3(C_6F_6)猝灭O-Ps的速率常数k~3(C_6F_6)=1.7×10~(10)(1mol~(-1)s~(-1)),以及六氟苯体系中三重态激发分子~3(C_6F_6)猝灭O-Ps的贡献。结果表明:~3(C_6F_6)对O-Ps寿命的影响并不很大。
This work investigated the effect of oxygen on the lifetime of Ps in dissolved hexafluorobenzene (C_6F_6). The initial ablation lifetime τ_3 ~ 0 = 4.15 ns of triplet positron (O-Ps) in C_6F_6 were obtained respectively. The rate constants of oxygen quenching O-Ps were k_ (O_2) = 1.8 × 10 ~ ~ (-1) s ~ (-1)). The rate constants of quenching O-Ps in the triplet excited molecule ~ 3 (C_6F_6) were k ~ 3 (C_6F_6) = 1.7 × 10 ~ ) s ~ (-1)) and the quenching of O-Ps by the triplet excited molecule ~ 3 (C_6F_6) in hexafluorobenzene system. The results showed that the effect of ~ 3 (C_6F_6) on the life of O-Ps was not significant.