engleski

Hydrogenated iron nanoparticles: unexplored dust grains

Studies in materials sciences have shown that Fe atoms and Fe nanoparticles could bind many H atoms. The importance of hydrogenated nanoparticles for a missing iron problem in astrophysics has recently been suggested [1]. The FeH molecule was already detected in the Sun, brown dwarfs, S stars, and M giants. Therefore, hydrogenated nanoparticles could be detected in winds of S stars and M giants. IRC +10216, were metallic iron and the FeCN molecule were already observed, is also a possible environment for a detection of hydrogenated iron nanoparticles. That FeH and FeH2 could form on dust grains was suggested a long time ago from laboratory astrophysics experiments [2]. In this work we present density functional theory calculations of IR [1] and X-rays [3] spectra of hydrogenated iron nanoparticles and discuss ways to detect them in space. [1] Bilalbegovic G., Maksimovic A., Mohacek-Grosev V., 2017, MNRAS Letters 466, L14 [2] Bar-Nun A., Pasternak M., Barett P. H. 1980, A&A, 87, 328 [3] Bilalbegovic G. et al, in preparation.

cosmic dust ; hydrogenated iron nanoparticles ; density functional theory ; infrared spectra ; x-rays spectra

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