Nowadays, ion bombardment became one of the powerful methods usually carried out to modify the surface characteristics of the polymeric materials. In this work, low-density polyethylene (LDPE) polymer samples were bombarded with different fluences by 130 keV He-ion beam. The X-ray diffraction patterns of the untreated sample as well as those exposed to He-ion beam revealed the crystalline nature of the samples. The effects of He-ion beam bombardment on the structural parameters e.g. crystal size, dislocation density, inter-chain separation, micro-strain, and distortion were studied. The optical absorption coefficient and refractive index were calculated as a function of He-ion beam fluences. The optical energy gap and Urbach energy were also evaluated. Wemple-DiDomenico effective single oscillator and Sellmeier models were both used to describe adequately the refractive index dispersion in the low absorption region. Graphical representation of the complex dielectric constant and dissipation factor was also presented. A significant modification in the structural and optical parameters was obtained by ion bombardment technique.

如今，离子轰击已成为通常用来改变聚合物材料表面特性的强大方法之一。在这项工作中，低密度聚乙烯（LDPE）聚合物样品被130 keV He离子束以不同的注量轰击。未经处理的样品以及暴露于He离子束的样品的X射线衍射图揭示了样品的晶体性质。研究了氦离子束轰击对晶体尺寸，位错密度，链间分离，微应变和变形等结构参数的影响。计算出的光吸收系数和折射率是He离子束通量的函数。还评估了光能隙和Urbach能量。Wemple-DiDomenico有效的单振荡器和Sellmeier模型均用于充分描述低吸收区的折射率色散。还给出了复数介电常数和耗散因数的图形表示。通过离子轰击技术对结构和光学参数进行了重大修改。