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Laboratory Spectra of Amorphous and Crystalline Olivine: An Application to Comet Halley IR Spectrum

Published online by Cambridge University Press:  12 April 2016

A. Blanco ,
V. Orofino ,
E. Bussoletti ,
S. Fonti ,
L. Colangeli  and
J. R. Stephens
A. Blanco
Affiliation:
Department of Physics, University of Lecce, C.P. 193, 73100 Lecce, Italy
V. Orofino
Affiliation:
Department of Physics, University of Lecce, C.P. 193, 73100 Lecce, Italy
E. Bussoletti
Affiliation:
Institute of Experimental Physics, IUN, Via Acton 38, 80133 Napoli, Italy
S. Fonti
Affiliation:
Institute of Experimental Physics, IUN, Via Acton 38, 80133 Napoli, Italy
L. Colangeli
Affiliation:
Engineering Faculty, University of Cassino, Via Zamosch 43, 03043 Cassino, Italy
J. R. Stephens
Affiliation:
Los Alamos National Laboratory, Los Alamos, NM 87545, USA

Abstract

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Among the various silicates proposed as components of cosmic dust grains, olivine is considered one of the most likely materials. In this work we present the infrared spectra of three different types of olivine grains: crystalline, amorphous and synthetic (also amorphous). While the first and second sample derive from the same natural mineral, the third one has been prepared in the laboratory according to the relative cosmic abundances of the elements. The experimental data are used to fit the emission feature observed in the comet Halley spectrum between 8 and 13 μm. Satisfactory results are obtained by using synthetic olivine mixed with a small amount (5%) of crystalline grains.

Type
Interplanetary Dust: Physical and Chemical Analysis
Information
International Astronomical Union Colloquium , Volume 126: Origin and Evolution of Interplanetary Dust , 1991 , pp. 125 - 128
Copyright
Copyright © Kluwer 1991

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