کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
5427200 1508619 2017 9 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Light scattering studies of randomly oriented polycrystalline fayalite micro particles as interstellar dust analogues
ترجمه فارسی عنوان
مطالعات پراکندگی نور از ذرات میکروسکوپی فایلیلیت پلی کریستالی به طور تصادفی به عنوان آنالیز گرد و غبار بین ستاره ای
کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه شیمی طیف سنجی
چکیده انگلیسی


- Fayalite micro particles were synthesized as representative of Interstellar dust analogue.
- Models of irregular shapes were generated.
- Light scattering computations were done using DDSCAT 7.3.0.
- Comparative analysis of computational and experimental results was performed.

Fayalite (Fe2Si04), the iron end-member of the olivine group, is found in various extraterrestrial environments including the interstellar medium and meteorite. Since the iron rich silicates, i.e. fayalites, are not abundantly found in earth, there has been lack of sufficient experimentation and modeling leading to the unavailability of sufficient experimental data of fayalite for comparative analyses with computations and astrophysical observations. In this work interstellar fayalite dust analogues were synthesized in the laboratory using simple chemical route. Shape and size dispersed interstellar dust analogue models for laboratory synthesized fayalite particles were developed for performing theoretical computations of light scattering parameters (e.g., angular profiles of intensity and degree of linear polarization, geometric and single-scattering albedo, asymmetry parameter and cross-sections of extinction and absorption) using discrete dipole approximation (DDA). In order to demonstrate the validity of our models, phase function and degree of linear polarization were measured using a laboratory based setup and the results were compared with DDA computed theoretical values at three wavelengths 543.5 nm, 594.5 nm and 632.5 nm respectively.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Quantitative Spectroscopy and Radiative Transfer - Volume 196, July 2017, Pages 213-221
نویسندگان
, , , ,