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1. Ab initio methods for L-edge x-ray absorption spectroscopy

   https://doi.org/10.1063/5.0029725  

   Kasper, Joseph M.; Stetina, Torin F.; Jenkins, Andrew J.; Li, Xiaosong (December 2020, Chemical Physics Reviews)

   null (Ed.)
2. X-Ray Observations of a z ∼ 6.2 Quasar/Galaxy Merger

   https://doi.org/10.3847/1538-4357/ab5585  

   Connor, Thomas; Bañados, Eduardo; Stern, Daniel; Decarli, Roberto; Schindler, Jan-Torge; Fan, Xiaohui; Farina, Emanuele Paolo; Mazzucchelli, Chiara; Mulchaey, John S.; Walter, Fabian (December 2019, The Astrophysical Journal)
3. In situ / operando synchrotron x-ray studies of metal additive manufacturing

   https://doi.org/10.1557/mrs.2020.275  

   Sun, Tao; Tan, Wenda; Chen, Lianyi; Rollett, Anthony (November 2020, MRS Bulletin)

   null (Ed.)

   Additive manufacturing (AM) comprises a group of transformative technologies that are likely to revolutionize manufacturing. In particular, laser-based metal AM techniques can not only fabricate parts with extreme complexity, but also provide innovative means for designing and processing new metallic systems. However, there are still several technical barriers that constrain metal AM. Overcoming these barriers requires a better understanding of the physics underlying the complex and dynamic laser–metal interaction at the heart of many AM processes. This article briefly describes the state of the art of in situ / operando synchrotron x-ray imaging and diffraction for studying metal AM, mostly the laser powder-bed fusion process. It highlights the immediate impact of operando synchrotron studies on the advancement of AM technologies, and presents future research challenges and opportunities. 

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4. In situ synchrotron x-ray studies of epitaxial SrCoO x films during ionic liquid gating

   https://doi.org/10.1063/5.0269796  

   Li, Yan; Wenderott, Jill K; Billo, Tadesse; Wang, Maoyu; Chang, Alvin; Cao, Hui; Yan, Xi; Buchholz, D Bruce; Feng, Zhenxing; Zhou, Hua; et al (June 2025, APL Materials)

   The manipulation of ions in complex oxide materials can be used to mimic brain-like plasticity through changes to the resistivity of a neuromorphic device. Advances in the design of more energy efficient devices require improved understanding of how ions migrate within a material and across its interface. We investigate the exchange of oxygen and hydrogen in a model SrCoOx epitaxial film—a material that transitions between a ferromagnetic metal and antiferromagnetic insulator depending on the oxygen concentration. Changes to the film during ionic liquid gating were measured by in situ synchrotron x-ray techniques as a function of time and gate voltage, examining the reversibility of the oxide over one complete gating cycle. We find that the out-of-plane lattice constant and oxygen vacancy concentration of SrCoOx are largely reversible although changes were observed in the ordered vacancy structure. Our results provide much needed insight into electrolyte-gated phase behavior in the transition metal oxides. 

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5. X-ray polarimetry of X-ray pulsar X Persei: another orthogonal rotator?

   https://doi.org/10.1093/mnras/stad1961  

   Mushtukov, A A; Tsygankov, S S; Poutanen, J; Doroshenko, V; Salganik, A; Costa, E; Marco, A Di; Heyl, J; Monaca, F La; Lutovinov, A A; et al (July 2023, Monthly Notices of the Royal Astronomical Society)

   ABSTRACT X Persei is a persistent low-luminosity X-ray pulsar of period of ≈ 835 s in a Be binary system. The field strength at the neutron star surface is not known precisely, but indirect signs indicate a magnetic field above 1013 G, which makes the object one of the most magnetized known X-ray pulsars. Here we present the results of observations X Persei performed with the Imaging X-ray Polarimetry Explorer (IXPE). The X-ray polarization signal was found to be strongly dependent on the spin phase of the pulsar. The energy-averaged polarization degree in 3–8 keV band varied from several to ∼20 per cent over the pulse with a phase dependence resembling the pulse profile. The polarization angle shows significant variation and makes two complete revolutions during the pulse period, resulting in nearly nil pulse-phase averaged polarization. Applying the rotating vector model to the IXPE data we obtain the estimates for the rotation axis inclination and its position angle on the sky, as well as for the magnetic obliquity. The derived inclination is close to the orbital inclination, reported earlier for X Persei. The polarimetric data imply a large angle between the rotation and magnetic dipole axes, which is similar to the result reported recently for the X-ray pulsar GRO J1008−57. After eliminating the effect of polarization angle rotation over the pulsar phase using the best-fitting rotating vector model, the strong dependence of the polarization degree with energy was discovered, with its value increasing from 0 at ∼2 keV to 30per cent at 8 keV. 

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