Compositional dependence of infrared absorption spectra of crystalline silicate. II. Natural and synthetic olivines

Astronomy and Astrophysics – Astrophysics

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Methods: Laboratory, Interplanetary Medium, Star: Circumstellar Matter, Ism: Dust, Extinction, Ism: Lines And Bands, Infrared: Ism

Scientific paper

The mass absorption spectra of crystalline olivine particles with different Mg/(Mg + Fe) ratios, between forsterite (Mg2SiO4, Fo) and fayalite (Fe2SiO4, Fa), were measured for synthetic and natural samples in the mid- and far-infrared regions. The main strong peaks show a systematic shift to longer wavelengths as the Mg/(Mg + Fe) ratio decreases. In the 10-17 mu m region, these trends are very clear, and the peak positions are a good indicator of the composition of dust grains. In the 20-100 mu m region, the trends are also rather clear, though they are slightly complicated; the intensity and width of the various bands become weak and broad, respectively, or the bands disappear as the concentration of Fo decreases. However, the trends are clear only in a limited composition range near Fo and Fa; the peak positions of 30, 50, and 69 mu m bands of forsterite shift linearly as the Fo concentration decreases to about Fo70. Those of the double band in the 50 mu m region for Fe-rich olivine shift linearly as the Fa concentration increases from Fo20 to Fa. When the spectral signature of Mg-rich or Fe-rich olivine can be observed, the peak positions in the 20-100 mu m region are a good indicator of the composition of dust grains.

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