Jin, S.; Flach, M.; Ebenbichler, A.; Cunningham, E.M.; Zamudio-Bayer, V.; Hirsch, K.; van der Linde, C.; Przybilla, N.; Oncak, M.; Lau, J. T.; Beyer, M.K.: X-ray absorption spectroscopy of FeH+ to aid its identification in astrochemical environments. Chemical Communications 61 (2025), p. 2048-2050
10.1039/d4cc04702h
Open Access Version
Abstract:
We present the first absorption spectrum of the unperturbed diatomic molecular ion FeH+ in any wavelength range. The cryogenic X-ray absorption spectrum at the L2 and L3 edge is consistent with an iron 3d occupation of 6.24e. Comparison with the interstellar absorption spectrum of Cygnus X-1 indicates that FeH+ cannot be ruled out as a component of the absorbing medium.