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000455134 1001_ $$0P:(DE-H253)PIP1008570$$aSchippers, Stefan$$b0$$eCorresponding author
000455134 245__ $$aNear L-edge Single and Multiple Photoionization of Doubly Charged Iron Ions
000455134 260__ $$aChicago, Ill. [u.a.]$$bUniv.11032$$c2021
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000455134 520__ $$aUsing the photon-ion merged-beams technique at a synchrotron light source, we have measured relative cross sections for single and up to five-fold photoionization of Fe$^{2+}$ ions in the energy range 690--920~eV. This range contains thresholds and resonances associated with ionization and excitation of $2p$ and $2s$ electrons. Calculations were performed to simulate the total absorption spectra. The theoretical results show very good agreement with the experimental data, if overall energy shifts of up to 2.5~eV are applied to the calculated resonance positions and assumptions are made about the initial experimental population of the various levels of the Fe$^{2+}$([Ar]$3d^6$) ground configuration. Furthermore, we performed extensive calculations of the Auger cascades that result when an electron is removed from the $2p$ subshell of Fe$^{2+}$. These computations lead  to a  better agreement with the measured product-charge-state distributions as compared to earlier work. We conclude that the $L$-shell absorption features of low-charged iron ions are useful for identifying gas-phase iron in the interstellar medium and for discriminating against the various forms of condensed-phase  iron bound to composite interstellar dust grains.
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000455134 7001_ $$00000-0001-5100-4229$$aBeerwerth, Randolf$$b1
000455134 7001_ $$0P:(DE-H253)PIP1014119$$aBari, Sadia$$b2
000455134 7001_ $$0P:(DE-H253)PIP1008569$$aBuhr, Ticia$$b3
000455134 7001_ $$0P:(DE-H253)PIP1008566$$aHolste, Kristof$$b4
000455134 7001_ $$0P:(DE-H253)PIP1020111$$aKilcoyne, David Lewis A$$b5
000455134 7001_ $$0P:(DE-H253)PIP1033062$$aPerry-Sassmannshausen, Alexander$$b6
000455134 7001_ $$0P:(DE-H253)PIP1033185$$aPhaneuf, Ronald A.$$b7
000455134 7001_ $$0P:(DE-H253)PIP1032399$$aReinwardt, Simon$$b8
000455134 7001_ $$0P:(DE-H253)PIP1023224$$aSavin, Daniel Wolf$$b9
000455134 7001_ $$0P:(DE-H253)PIP1021880$$aSchubert, Kaja$$b10$$udesy
000455134 7001_ $$0P:(DE-H253)PIP1024535$$aFritzsche, Stephan$$b11
000455134 7001_ $$0P:(DE-H253)PIP1001989$$aMartins, Michael$$b12
000455134 7001_ $$0P:(DE-H253)PIP1008567$$aMueller, Alfred$$b13
000455134 77318 $$2Crossref$$3journal-article$$a10.3847/1538-4357/abcc64$$bAmerican Astronomical Society$$d2021-02-11$$n1$$p52$$tThe Astrophysical Journal$$v908$$x1538-4357$$y2021
000455134 773__ $$0PERI:(DE-600)2006858-X$$a10.3847/1538-4357/abcc64$$gVol. 908, no. 1, p. 52 -$$n1$$p52$$tThe astrophysical journal / 2$$v908$$x1538-4357$$y2021
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