X-ray absorption spectroscopy of FeH+ to aid its identification in astrochemical environments†
Shan
Jin, 
a
Max
Flach,
bc
Alexander
Ebenbichler,
d
Ethan M.
Cunningham,
a
Vicente
Zamudio-Bayer,
b
Konstantin
Hirsch,
b
Christian
van der Linde,
a
Norbert
Przybilla,
*d
Milan
Ončák,
a
J. Tobias
Lau
bc
and
Martin K.
Beyer
*a
a
Max
Flach,
bc
Alexander
Ebenbichler,
d
Ethan M.
Cunningham,
a
Vicente
Zamudio-Bayer,
b
Konstantin
Hirsch,
b
Christian
van der Linde,
a
Norbert
Przybilla,
*d
Milan
Ončák,
a
J. Tobias
Lau
bc
and
Martin K.
Beyer
*a
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.
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