Błachucki, Wojciech Hoszowska, Joanna Dousse, Jean-Claude Kayser, Yves Stachura, Regina Tyra³a, Krzysztof Wojtaszek, Klaudia Sá, Jacinto Szlachetko, Jakub 2017-10-01 We review the high energy resolution off-resonant spectroscopy (HEROS) technique. HEROS probes the unoccupied electronic states of matter in a single-shot manner thanks to the combination of off-resonant excitation around atomic core states using wavelength dispersive X-ray detection setups. In this review we provide a general introduction to the field of X-ray spectroscopy together with the specification of the available X-ray techniques and X-ray methodologies. Next, the theoretical description of the HEROS approach is introduced with a special focus on the derivation of the X- ray emission and X-ray absorption correspondence relation at off-resonant excitation conditions. Finally, a number of experimental HEROS reports are reviewed in the field of chemistry and material science. We emphasize the applicability of HEROS to pulsed X-ray sources, like X-ray free electron lasers, and support the review with experimental examples. The review is complemented with perspectives on and possible further applications of the HEROS technique to the field of X-ray science. application/pdf https://folia.unifr.ch/global/documents/306494 https://folia.unifr.ch/documents/306494/files/dou_her.pdf eng info:eu-repo/semantics/altIdentifier/doi/10.1016/j.sab.2017.08.002 info:eu-repo/semantics/openAccess License undefined Spectrochimica Acta Part B: Atomic Spectroscopy. - 2017, vol. 136, p. 23–33 info:eu-repo/classification/udc/53 High energy resolution off-resonant spectroscopy: A review http://purl.org/coar/resource_type/c_6501