Astronomy and Astrophysics – Astrophysics
Scientific paper
Feb 1976
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976ap%26ss..39l..33d&link_type=abstract
Astrophysics and Space Science, vol. 39, Feb. 1976, p. L33-L36. Research supported by the National Research Council of Canada.
Astronomy and Astrophysics
Astrophysics
1
Cosmic Dust, Infrared Spectra, Interstellar Extinction, Magnesium Oxides, Absorption Spectra, Forbidden Transitions, Mie Scattering, Particle Size Distribution, Pressure Broadening, Spectral Line Width
Scientific paper
Surface stresses in small particles are investigated as a possible mechanism which can lead to excess broadening and changes in intensity of strong resonances in the calculated IR extinction spectrum of interstellar dust. The pressure shift produced in the IR extinction spectrum of MgO is estimated by calculating the change in the frequency of the Froelich mode. It is shown that, for a distribution of particle sizes, a broadening of the resonance due to the Froelich mode will be caused by surface stresses. It is concluded that similar effects can be expected for surface modes as well, and that IR spectral features due to small interstellar grains will be broader, and perhaps weaker, than those predicted from Mie-scattering calculations.
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