Laboratory production of magnesium sulfide grains and their characteristic infrared spectra due to shape

Y. Kimura, M. Kurumada, K. Tamura, C. Koike, H. Chihara, C. Kaito

Research output: Contribution to journalArticle

12 Citations (Scopus)

Abstract

Nanosized MgS grains, which have been considered the origin of the 30 μm emission feature of carbon-rich evolved objects, were produced from the gas phase using an advanced gas evaporation method. The far-infrared spectrum of cubic MgS grains showed a characteristic absorption peak at 311 cm-1 (32.1 μm) with three shoulders at 460,400 and 262 cm-1 (21.7, 25.0 and 38.2 μm). On the other hand, when the grains were roundish or network-like, the absorption peak at 250 cm-1 became predominant. The cubic MgS grains were produced by direct nucleation from the gas phase. In the case of production via a gas-solid reaction, the MgS grains were network-like. Therefore, the formation environments of MgS grains around carbon-rich evolved objects may be predicted from the intensity of 310 and 250 cm-1 bands. We suggest that the origins of the absorption band at 310 and 250 cm -1 are (100), (110) and/or (111) surfaces of MgS grains, respectively.

Original languageEnglish
Pages (from-to)507-512
Number of pages6
JournalAstronomy and Astrophysics
Volume442
Issue number2
DOIs
Publication statusPublished - 2005 Nov 1

Keywords

  • Infrared: ISM
  • Infrared: Stars
  • Methods: laboratory
  • Stars: AGB and post-AGB

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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