engleski

Hydrogenated iron nanoparticles in the ISM

It was found that the FeH lines exist in the spectra of some stars, but none of the spectral features in the ISM have been assigned to this molecule. Iron atoms in the ISM could interact with hydrogen and produce Fe-H nanoparticles which sometimes contain many H atoms. Infrared spectra of hydrogenated iron nanoparticles are calculated using the quantum density functional theory methods and it was found that they consist of broad, overlapping bands. Desorption of H2 could induce spinning of these small Fe-H dust grains. Some of hydrogenated iron nanoparticles posses magnetic and electric moments and should interact with electromagnetic fields in the ISM. Fe_nH_m nanoparticles could contribute to the polarization of the ISM and the anomalous microwave emission. We described the conditions required to form FeH and Fe_nH_m in the ISM. New experimental, theoretical, and observational studies are needed to reveal a role of hydrogenated iron nanoparticles in the ISM.

ISM ; hydrogenated iron nanoparticles ; cosmic dust ; molecules in space ; density functional theory

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