富勒烯与星际消光  

Fullerenes and interstellar extinction

作　　者：粟雪莲 李祺 杨雪娟 李爱根 向福元 SU XueLian;LI Qi;YANG XueJuan;LI AiGen;XIANG FuYuan(School of Physics and Optoelectronics,Xiangtan University,Xiangtan 411105,China;Department of Physics and Astronomy,University of Missouri,Columbia 65211,USA)

机构地区：[1]湘潭大学物理与光电工程学院,湘潭411105 [2]Department of Physics and Astronomy,University of Missouri,Columbia 65211,USA

出　　处：《中国科学：物理学、力学、天文学》2022年第12期162-168,共7页Scientia Sinica Physica,Mechanica & Astronomica

基　　金：国家自然科学基金(编号:12122302,U2031114);中国载人航天工程巡天空间望远镜专项科学研究经费(编号:CMS-CSST-2021-A09)资助项目。

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C_(60)和C_(70)的红外振动光谱.本文重点研究了三种主要的富勒烯C_(60),C_(70)和C_(84)的星际丰度.利用实验获得的C_(60),C_(70)和C_(84)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C_(60),C_(70)和C_(84)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).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 C_(60)and C_(70).Herein,we focus on the abundances of three fullerenes,C_(60),C_(70),and C_(84),in the diffuse interstellar medium.Using the experimentally obtained dielectric functions of C_(60),C_(70),and C_(84),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 C_(60),C_(70),and C_(84),respectively.

关 键 词：富勒烯 星际消光 星际尘埃 丰度 

分 类 号：P155.2[天文地球—天文学]