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Title: Origin of the diffuse interstellar absorption bands: Transition metal ions in oxide grains

Abstract

A survey of the spectra of transition metal ions in oxide lattices is given. It is shown that electronic transitions of ions in defective sites in interstellar grain material have oscillator strengths that are two to three orders of magnitude larger than they are in ''perfect'' crystals. With this enhancement, the abundance of ions such as Cr/sup 3 +/, Mn/sup 4 +/, Ni/sup 2 +/ is sufficient to account for most of the diffuse interstellar features. The sharper diffuse features could therefore be due to field-independent transitions in transition metal ions in MgO. Using new data provided by Herbig, three very sharp interstellar features are shown to coincide in wavelength with /sup 4/A/sub 2/-/sup 2/E transitions of Cr/sup 3 +/ and Mn/sup 4 +/ in MgO. A further sharp line may arise in an electronic transition of a defect center in MgO.

Authors:
Publication Date:
Research Org.:
Physics Department, York University
OSTI Identifier:
6271390
Resource Type:
Journal Article
Journal Name:
Astrophys. J.; (United States)
Additional Journal Information:
Journal Volume: 227:3
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; INTERSTELLAR GRAINS; ABSORPTION SPECTRA; TRANSITION ELEMENT COMPOUNDS; ABUNDANCE; ELECTRONIC STRUCTURE; ENERGY-LEVEL TRANSITIONS; IONS; OXIDES; CHALCOGENIDES; CHARGED PARTICLES; OXYGEN COMPOUNDS; PARTICLES; SPECTRA; 640105* - Astrophysics & Cosmology- Galaxies

Citation Formats

Duley, W.W. Origin of the diffuse interstellar absorption bands: Transition metal ions in oxide grains. United States: N. p., 1979. Web. doi:10.1086/156792.
Duley, W.W. Origin of the diffuse interstellar absorption bands: Transition metal ions in oxide grains. United States. doi:10.1086/156792.
Duley, W.W. Thu . "Origin of the diffuse interstellar absorption bands: Transition metal ions in oxide grains". United States. doi:10.1086/156792.
@article{osti_6271390,
title = {Origin of the diffuse interstellar absorption bands: Transition metal ions in oxide grains},
author = {Duley, W.W.},
abstractNote = {A survey of the spectra of transition metal ions in oxide lattices is given. It is shown that electronic transitions of ions in defective sites in interstellar grain material have oscillator strengths that are two to three orders of magnitude larger than they are in ''perfect'' crystals. With this enhancement, the abundance of ions such as Cr/sup 3 +/, Mn/sup 4 +/, Ni/sup 2 +/ is sufficient to account for most of the diffuse interstellar features. The sharper diffuse features could therefore be due to field-independent transitions in transition metal ions in MgO. Using new data provided by Herbig, three very sharp interstellar features are shown to coincide in wavelength with /sup 4/A/sub 2/-/sup 2/E transitions of Cr/sup 3 +/ and Mn/sup 4 +/ in MgO. A further sharp line may arise in an electronic transition of a defect center in MgO.},
doi = {10.1086/156792},
journal = {Astrophys. J.; (United States)},
number = ,
volume = 227:3,
place = {United States},
year = {1979},
month = {2}
}