Missing Fe: hydrogenated iron nanoparticles

Bilalbegović, Goranka and Maksimović, Aleksandar and Mohaček-Grošev, Vlasta (2017) Missing Fe: hydrogenated iron nanoparticles. Monthly Notices of the Royal Astronomical Society, 466 (1). L14-L18. ISSN 0035-8711

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Although it was found that the FeH lines exist in the spectra of some stars, none of the spectral features in the ISM have been assigned to this molecule. We suggest that iron atoms interact with hydrogen and produce Fe-H nanoparticles which sometimes contain many H atoms. We calculate infrared spectra of hydrogenated iron nanoparticles using density functional theory methods and find 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. FenHm nanoparticles could contribute to the polarization of the ISM and the anomalous microwave emission. We discuss the conditions required to form FeH and FenHm in the ISM.

Item Type: Article
Keywords: ISM: molecules, ISM: lines and bands, astrochemistry, methods: numerical, ISM: magnetic fields, stars: individual: IRC+10216
Date: 2017
Subjects: NATURAL SCIENCES > Physics > Astronomy and Astrophysics
Additional Information: © 2016 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society. Accepted 2016 November 1. Received 2016 October 14; in original form 2016 July 8.
Divisions: Faculty of Science > Department of Physics
Publisher: Oxford University Press
Depositing User: Gordana Stubičan Ladešić
Date Deposited: 20 Nov 2017 17:08
Last Modified: 20 Nov 2017 17:11
URI: http://digre.pmf.unizg.hr/id/eprint/5722

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