快重离子辐照参数对白云母光学性质的影响
Effects of swift heavy ions irradiation parameters on optical properties of muscovite mica
摘要：
在HIRFL中，用Sn、Bi、Nd等快重离子辐照了25 μm厚的白云母片。注量范围为1 $\times$ 10^{10}离子/cm ^2至8 $\times$ 10^{11}离子/cm ^2。电子能量损失（dE/dx）e从14.7keV/nm增加到31.2keV/nm。利用紫外-可见光谱分析了辐照前后云母的带隙和Urbach能.随着（dE/dx）_e的增大，由干涉现象引起的吸收光谱中长波长的周期性条纹受到干扰。这表明云母的四面体-四面体-四面体（TOT）层之间的化学键被破坏。因此，辐照后光滑表面裂开。随着（dE/dx）_e和注量的增加，带隙变窄。随着（dE/dx）_e和注量的增加，Urbach能量值逐渐增加。结果表明，随着（dE/dx）_e和辐照剂量的增加，云母中的缺陷数量和非晶结构比例增加。能量密度对云母的光学性质有着非常重要的影响。
英文摘要：
Muscovite mica sheets with a thickness of 25 μm were irradiated by various kinds of swift heavy ions (Sn, Xe and Bi) in HIRFL. The fluences ranged from 1$\times$10^{10} ions/cm^2 to 8$\times$10^{11} ions/cm^2. The electronic energy loss (dE/dx)_e was increased from 14.7 keV/nm to 31.2 keV/nm. The band gap and Urbach energy of pristine and irradiated mica were analyzed by ultraviolet- visible spectroscopy. Periodic fringes in long wave length of the absorption spectra caused by interference phenomenon, were disturbed as the (dE/dx)_e increased. It was suggested that the chemical bonds between Tetrahedral-Octohedral-Tetrahedral (TOT) layers of mica were destroyed. Thus the smooth surface was cleaved after irradiation. The band gap was narrowed down with the increasing (dE/dx)_e and fluences. The values of Urbach energy were increased as the (dE/dx)_e and fluences gradually increased. It was indicated that the amount of defects and the proportion of amorphous structure were increased in mica irradiated under increased (dE/dx)_e and fluences. Fluences took a distinctly important role in optical properties of mica.
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