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The scheme is based on a previously formulated theory for predicting optical absorption and magnetic circular dichroism (MCD) spectra. The scheme operates in the framework of the full semi-classical field\u2013matter interaction operator, thus generating a powerful and general computational scheme capable of computing the absorption, circular dichroism (CD), and MCD spectra. In addition, our implementation includes the treatment of relativistic effects in the framework of quasidegenerate perturbation theory, which accounts for scalar relativistic effects (in the self-consistent field step) and spin\u2013orbit coupling (in the TD-DFT step), as well as external magnetic field perturbations. Hence, this formalism is also able to probe spin-forbidden transitions. The random orientations of molecules are taken into account by a semi-numerical approach involving a Lebedev numerical quadrature alongside analytical integration. It is demonstrated that the numerical quadrature requires as few as 14 points for satisfactory converged results, thus leading to a highly efficient scheme, while the calculation of the exact transition moments creates no computational bottlenecks. It is demonstrated that at zero magnetic field, the CD spectrum is recovered, while the sum of left and right circularly polarized light contributions provides the linear absorption spectrum. The virtues of this efficient and general protocol are demonstrated on a selected set of organic molecules where the various contributions to the spectral intensities have been analyzed in detail.<\/jats:p>","DOI":"10.1063\/5.0094709","type":"journal-article","created":{"date-parts":[[2022,7,25]],"date-time":"2022-07-25T15:35:02Z","timestamp":1658763302000},"update-policy":"https:\/\/doi.org\/10.1063\/aip-crossmark-policy-page","source":"Crossref","is-referenced-by-count":18,"title":["Going beyond the electric-dipole approximation in the calculation of absorption and (magnetic) circular dichroism spectra including scalar relativistic and spin\u2013orbit coupling effects"],"prefix":"10.1063","volume":"157","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-6970-0609","authenticated-orcid":false,"given":"Nicol\u00e1s O.","family":"Foglia","sequence":"first","affiliation":[{"name":"Max-Planck-Institut f\u00fcr Kohlenforschung , Kaiser-Wilhelm-Platz 1, 45470 M\u00fclheim an der Ruhr, Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-1550-5162","authenticated-orcid":false,"given":"Dimitrios","family":"Maganas","sequence":"additional","affiliation":[{"name":"Max-Planck-Institut f\u00fcr Kohlenforschung , Kaiser-Wilhelm-Platz 1, 45470 M\u00fclheim an der Ruhr, Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-4691-0547","authenticated-orcid":false,"given":"Frank","family":"Neese","sequence":"additional","affiliation":[{"name":"Max-Planck-Institut f\u00fcr Kohlenforschung , Kaiser-Wilhelm-Platz 1, 45470 M\u00fclheim an der Ruhr, Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"317","published-online":{"date-parts":[[2022,8,25]]},"reference":[{"key":"2023081006145278500_c1","doi-asserted-by":"publisher","first-page":"13805","DOI":"10.1021\/acs.inorgchem.0c02755","article-title":"Impact of modern spectroscopy in inorganic chemistry","volume":"59","year":"2020","journal-title":"Inorg. 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