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Prog. Phys."],"published-print":{"date-parts":[[2026,10,1]]},"abstract":"<jats:title>Abstract<\/jats:title>\n                  <jats:p>Small-angle scattering (SAS) with x-rays and neutrons is widely used in structural biology, soft matter, and colloidal science to probe molecular structures in solution. SAS rests on a single physical principle: wave interference from a distribution of scatterers. Yet the theoretical foundations of SAS are spread across the literature, often based on differing notation, definitions, and implicit assumptions. We present the theory of SAS in solution starting from the first Born approximation as a continuous derivation, spanning the scattering of a single electron to the observed intensity of a molecular solution and its comparison with atomistic structural models. The derivation is explicit throughout\u2014approximations, averaging procedures, and algebraic manipulations are stated rather than assumed\u2014and the resulting expressions are independent of the probe (x-ray or neutron) and apply to both rigid and flexible molecules. The framework resolves several ambiguities in the current literature, notably the role of background subtraction as a theoretical rather than a purely experimental operation and the role of boundary cross-terms in justifying that subtraction. A central result is that analytical scattering calculations and approaches based on explicit-solvent molecular dynamics, typically treated as distinct traditions, are realizations of the common theoretical framework derived here. As the precision and reproducibility of SAS data continue to increase, this comprehensive framework provides a basis for integrating theory, simulation, and experiment in future developments of SAS.<\/jats:p>","DOI":"10.1088\/1361-6633\/aead1d","type":"journal-article","created":{"date-parts":[[2026,9,28]],"date-time":"2026-09-28T22:51:52Z","timestamp":1790635912000},"page":"108101","update-policy":"https:\/\/doi.org\/10.1088\/crossmark-policy","source":"Crossref","is-referenced-by-count":0,"title":["Small-angle solution scattering: from fundamental theory to practical approximations"],"prefix":"10.1088","volume":"89","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-8743-7990","authenticated-orcid":true,"given":"Kristian","family":"Lytje","sequence":"first","affiliation":[{"name":"Universit\u00e4t des Saarlandes"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-7768-0206","authenticated-orcid":true,"given":"Jan Skov","family":"Pedersen","sequence":"additional","affiliation":[{"name":"Aarhus University"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-7716-1767","authenticated-orcid":false,"given":"Jochen S","family":"Hub","sequence":"additional","affiliation":[{"name":"Universit\u00e4t des Saarlandes"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"266","published-online":{"date-parts":[[2026,10,21]]},"reference":[{"key":"ropaead1dbib1","doi-asserted-by":"publisher","DOI":"10.1063\/1.2121687","type":"journal-article","volume":"123","author":"Abascal","year":"2005","journal-title":"J. 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