Near-infrared absorption properties of oxygen-rich stardust analogs - The influence of coloring metal ions

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Volume 526 (February 2011)

A&A, 526 (2011) A68

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Table 1

Electronic band edges including strong excitons in terms of energy E_g, wavelength λ_g, longitudial optical lattice frequencies ω_LO, and onset wavelengths λ* for the transparency regions for different materials (see text for more details).

Material	E _g	λ _g	ω _LO	λ ^∗	Ref.
	[eV]	[μm]	[cm^-1]	[μm]

Am. SiO₂	8.3	0.15	1245	4.01	[1]
MgO	7.5	0.17	728	6.87	[2]
MgAl₂O₄	7.75	0.16	877.2	5.7	[3]
Mg₂SiO₄	7.5	0.17	1078	4.6	[4], [5]
TiO₂ rutile	2.9	0.43	831.3	6	[6]
TiO₂ anatase	3.2	0.39	872.8	5.7	[7], [8]
FeO	2.3	0.54	526	9.5	[9], [10]

References. [1] Philipp (1985); [2] Roessler & Huffman (1991); [3] Tropf & Thomas (1991); [4] Shankland (1968); [5] Sogawa et al. (2006); [6] Ribarsky (1985); [7] Tang et al. (1993); [8] Posch et al. (2003); [9] Park et al. (1999); [10] Henning et al. (1995).

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