化合物和合金中离子投影射程分布矩的计算(Ⅱ)——轻离子(Z1≤10)的射程分布矩

本文根据离子在固体材料中电子阻止截面的实验资料,给出了低能Li⁺,Be⁺,B⁺,C⁺,N⁺,O⁺,F⁺,Ne⁺等离子在固体中电子阻止截面S_e的经验公式。这些经验公式既能够很好地反映电子阻止本领的Z₁和Z₂振荡、又能正确地给出S_e随离子能量E的变化关系。用这种以实验为基础的S_e经验公式和符合于WHB势的核散射函数,计数了从H⁺到Ne⁺十种轻离子在非晶Al₂O₃,SiO₂,20/25/Nb不锈钢,LiNbO₃和UO₂等材料中的投影射程分布的一次至三次矩。将计算值与近几年的实验测量及其他人的计算结果进行了比较,在低能端,我们计算的平均投影射程R_p与实验符合得更好。关键词：

CALCULATION OF PROJECTED ION-RANGE DISTRIBUTION MOMENTS IN COMPOUNDS AND ALLOYS (Ⅱ)——RANGE DISTRIBUTION MOMENTS FOR LIGHT IONS (Z1≤10)

An empirical formula of electronic Stopping Cross Section, S_e, for low energy ions, such as Li⁺,Be⁺,B⁺,C⁺,N⁺,O⁺,F⁺ and Ne⁺, in solid materials is established according to the experimental electronic stopping power data in solid media. The formula can be used not only to describe the experimental Z₁ and Z₂-oscillation of electronic stopping power, but also to describe very satifactorily the S_e varying with ion energy, E. The projected rang distribution moments up to third order for ten light ion species from H⁺ to Ne⁺ in different substrates, such as amorphous Al₂O₃,SiO₂, 20/25/Nb stainless steel, LiNbO₃ and UO₂, are calculated by use of the electronic stopping cross section formula proposed by the present authors and the nuclear scattering function which agrees with the WHB atomic interaction potential. Our theoretical results are compared with the experimental results published recently, and our projected ranges, R_p agree with the experimental measurements more closely in the low energy end of the energy regime which we deal with in the present work.