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

页码：92 / 96

页数：5

共 25 条

[21] THE ROLE OF CAVITIES AND MANTLES IN THE ULTRAVIOLET EXTINCTION PEAK OF GRAPHITE SPHERES WITH PARTICULAR REFERENCE TO A POSSIBLY DISCOVERED C-60 STRUCTURE [J].