Media type: E-Article Title: Spin–Orbit Natural Transition Orbitals and Spin-Forbidden Transitions Contributor: Feng, Rulin; Yu, Xiaojuan; Autschbach, Jochen imprint: American Chemical Society (ACS), 2021 Published in: Journal of Chemical Theory and Computation Language: English DOI: 10.1021/acs.jctc.1c00776 ISSN: 1549-9618; 1549-9626 Origination: Footnote: