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However, accurately calculating spectral features at the L or M edges is challenging due to the significant influence of spin\u2013orbit and multiplet effects. While scalar-relativistic effects can be incorporated with minimal computational cost, accounting for spin\u2013orbit interactions requires complex frameworks that can be computationally expensive. In this work, we develop a reduced-cost state-interaction approach for simulating near-edge soft x-ray absorption spectra of closed-shell transition metal complexes with relativistic effects incorporated using the ZORA-Kohn\u2013Sham Hamiltonian. The computed spectra closely agree with those obtained with state-of-the-art approaches. This methodology provides a practical and cost-effective alternative to more rigorous two-component methods, making it particularly valuable for large-scale calculations and applications such as resonant inelastic x-ray scattering simulations, where capturing a large number of excited states is essential.<\/jats:p>","DOI":"10.1063\/5.0276628","type":"journal-article","created":{"date-parts":[[2025,9,4]],"date-time":"2025-09-04T10:55:09Z","timestamp":1756983309000},"update-policy":"https:\/\/doi.org\/10.1063\/aip-crossmark-policy-page","source":"Crossref","is-referenced-by-count":4,"title":["Fast simulation of soft x-ray near-edge spectra using a relativistic state-interaction approach: Application to closed-shell transition metal complexes"],"prefix":"10.1063","volume":"163","author":[{"ORCID":"https:\/\/orcid.org\/0009-0007-8519-915X","authenticated-orcid":false,"given":"Sarah","family":"Pak","sequence":"first","affiliation":[{"name":"Department of Chemistry, The University of Memphis 1 , Memphis, Tennessee 38152,","place":["USA"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0009-0001-1966-7943","authenticated-orcid":false,"given":"Muhammed A.","family":"Dada","sequence":"additional","affiliation":[{"name":"Department of Chemistry, The University of Memphis 1 , Memphis, Tennessee 38152,","place":["USA"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-3625-366X","authenticated-orcid":false,"given":"Niranjan","family":"Govind","sequence":"additional","affiliation":[{"name":"Physical and Computational Sciences Directorate, Pacific Northwest National Laboratory 2 , Richland, Washington 99352,","place":["USA"]},{"name":"Department of Chemistry, University of Washington 3 , Seattle, Washington 98195,","place":["USA"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-2126-8378","authenticated-orcid":false,"given":"Daniel R.","family":"Nascimento","sequence":"additional","affiliation":[{"name":"Department of Chemistry, The University of Memphis 1 , Memphis, Tennessee 38152,","place":["USA"]}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"317","published-online":{"date-parts":[[2025,9,4]]},"reference":[{"key":"2025090406550344700_c1","doi-asserted-by":"publisher","first-page":"336","DOI":"10.1038\/nphoton.2007.76","volume":"1","year":"2007","journal-title":"Nat. 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