Astronomy and Astrophysics – Astrophysics
Scientific paper
May 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982apj...256l..61m&link_type=abstract
Astrophysical Journal, Part 2 - Letters to the Editor, vol. 256, May 15, 1982, p. L61-L64. Research supported by the Natural Sci
Astronomy and Astrophysics
Astrophysics
34
Interstellar Matter, Ultraviolet Spectra, Magnesium Oxides, Near Ultraviolet Radiation, Silicon Dioxide, Simulation
Scientific paper
Experiments with the spectrum of MgO powders revealed that absorption by O(2-) ions in low coordination sites on the particle surfaces yields a bandwidth similar to the interstellar feature near 220 nm. The powders were heated to 900 C to create outgassing and placed in a chamber for excitation with UV radiation to monitor the luminescence as a function of the wavelength of the radiation. Results are presented for the wavelength dependence over the wavelength range 150-300 nm. A secondary absorption peak was observed at 270 nm. It was found that photoexcitation of MgO produced lines very similar to those which originate from SiO2. The observed transition at 220 and absorption at 160 nm are suggested to therefore arise from electronic transition in O(2-) ions in oxygen-bearing dust, which is suspected to be common in MgO and SiO2 rich regions. Greater clarification is indicated to discern properties of the UV spectrum of Mg and Si.
Duley Walter W.
Maclean S.
Millar Thomas J.
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