摘要: 在兰州重离子加速器国家实验室测量了1.8 MeV Xe^q+离子分别轰击N型和P型Si两种靶材表面时的电子发射产额。实验中，通过改变入射离子的电荷态，研究了入射离子势能沉积对两种靶材表面电子发射产额的贡献。结果发现同一离子入射时，N型Si表面的电子发射产额高出P型Si表面的电子发射产额约12.5%；对于具有相同入射动能的Xe^q+离子，两种靶材表面的电子发射产额均随着入射离子势能的增加而线性增加。此外，还测量了3.4 MeV Xe^q+离子分别轰击以上两种靶材时的电子发射产额，得到了类似的结果。本文利用功函数分别从动能电子发射和势能电子发射两个角度对实验结果进行了分析讨论。

The electron emissions from N-type Si and P-type Si induced by 1.8 MeV ¹²⁹Xe^q+are measured in the National Laboratory of Heavy Ion Research Facility in Lanzhou,The contribution to electron emission yield from potential energy of incident ions is studied through changing the charge state of incident ions.The results show that for the same incident ion,electron emission yield of N type Si surface is higher than that of P-type Si surface about 12.5%.For incident ions with the same kinetic energy,both electron emission yields of two targets increase linearly with incident ion energy.In addition,the electron emissions induced by 3.4 MeV ¹²⁹Xe^q+from N-type Si and P-type Si mentioned above are measured,which give similar results.The experimental results are analyzed and discussed using work function from two angles of the kinetic electron emission and the potential energy electron emission.