【摘要】 本文用正电子湮没方法研究了在掺Na⁺条件下,单纯、附色和γ射线辐照的KCl单晶的湮设寿命以及Doppler展宽S参数与掺Na⁺量的关系。结果表明掺Na⁺量为800ppm的KCl单晶空位浓度最小,为4.24×10¹⁷/cm³,它接近于纯KCl晶体的空位浓度。在附色的KCl晶体中存在明显的F心。S参数主要是受卤族阴离子外层电子的影响。此外还对掺Na⁺的KCl单晶正电子湮没机制进行了讨论。更多还原

【Abstract】 The relation of the live times and S parameters with doped quantities of Na⁺ have beenstudied by positron annihilation method in pure, colourable and irradiant KCl single crystals,The results show that the concentration of vacancies of KCl doped with 800ppm Na⁺ is 4.24×10¹⁷/cm³. It is close to that of the pure KCl crystal. The obvious F centers exist in the coloratedcrystal. The S parameters are mainly influenced by the external electrons of halide ions. Me-chanism of annihilation of KCl crystal doped with Na⁺ has been discussed.更多还原