【摘要】 近年来,富勒烯这一重要碳尘埃在天文观测上得到了证认,多种天体环境中均探测到了C₆₀和C₇₀的红外振动光谱.本文重点研究了三种主要的富勒烯C₆₀,C₇₀和C₈₄的星际丰度.利用实验获得的C₆₀,C₇₀和C₈₄的介电函数,计算了它们在可见光和紫外波段的吸收特性.通过与星际消光曲线的比较,得出C₆₀,C₇₀和C₈₄在星际空间所占碳的含量上限（相对氢来说）分别为5,7,5 ppm （其中ppm是百万分比）.更多还原

【Abstract】 In recent years,the presence of fullerenes,an important carbon dust species,in various astrophysical regions has been confirmed via astronomical observations of the infrared vibrational spectra of C₆₀and C₇₀.Herein,we focus on the abundances of three fullerenes,C₆₀,C₇₀,and C₈₄,in the diffuse interstellar medium.Using the experimentally obtained dielectric functions of C₆₀,C₇₀,and C₈₄,we calculate their absorption properties in the visible and ultraviolet bands.By comparing with the interstellar extinction curve,we derive an upper limit of 5,7,and 5 ppm for the C/H abundance of C₆₀,C₇₀,and C₈₄,respectively.更多还原