ON THE 2175-ANGSTROM ABSORPTION-BAND OF HOLLOW, ONION-LIKE CARBON PARTICLES

被引：48
|
作者：
HENRARD, L
LUCAS, AA
LAMBIN, P
机构：
[1] Inst. for Studs. in Interface Sci., Fac. Notre-Dame de la Paix, B5000 Namur, 61, rue de Bruxelles
来源：
ASTROPHYSICAL JOURNAL | 1993年 / 406卷 / 01期
关键词：
DUST; EXTINCTION; ISM; MOLECULES;
D O I：
10.1086/172422
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
We present a theoretical result on the ultraviolet absorption of nano-scale graphite onions with a central void. The polarizability and the extinction cross section of particles in this geometry are obtained in the electrostatic (nonretarded) approximation and using a ''spherically uniaxial'' dielectric tensor transported from planar graphite. We study the influence of the ratio r/R of the inner and outer radii on the extinction efficiency. It appears that the onion particles for r/R almost-equal-to 0.6 well reproduce the observed UV absorption bump of interstellar dust around 5.7 eV (4.6 mum-1). We also investigate the effects of the hollow structure of the carbon particles on a second absorption peak around 18 eV.
引用
收藏
页码：92 / 96
页数：5
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