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Computations of natural optical activity (OA) from first principles (ab initio) have become indispensable in chiroptical studies of molecular systems. Calculations are used to assign absolute configurations and to analyze chiroptical data, providing a basis for understanding their origin as well as for assigning and predicting experimental results. In this article, methodology for OA computations is outlined and accompanied by a review of selected, mainly recent (ca. 2010–2016) achievements in optical rotation, electronic and vibrational circular dichroism, and Raman OA calculations. We discuss some important aspects of the computational models and methodological developments, along with recently proposed approaches to analyze and interpret OA parameters. We highlight applications of chiroptical computational methods in studies of helicenes and chiral nanoparticles.
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