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The efficient gas\u2010phase photolysis of Hg<jats:sup>II<\/jats:sup> and Hg<jats:sup>I<\/jats:sup> has recently been reported. However, whether the photolysis of Hg<jats:sup>II<\/jats:sup> leads to other stable Hg<jats:sup>II<\/jats:sup> species, to Hg<jats:sup>I<\/jats:sup>, or to Hg<jats:sup>0<\/jats:sup> and its competition with thermal reactivity remain unknown. Herein, we show that all oxidized forms of mercury rapidly revert directly and indirectly to Hg<jats:sup>0<\/jats:sup> by photolysis. Results are based on non\u2010adiabatic dynamics simulations, in which the photoproduct ratios were determined with maximum errors of 3%. We construct for the first time a complete quantitative mechanism of the photochemical and thermal conversion between atmospheric Hg<jats:sup>II<\/jats:sup>, Hg<jats:sup>I<\/jats:sup>, and Hg<jats:sup>0<\/jats:sup> compounds. These results reveal new fundamental chemistry that has broad implications for the global atmospheric Hg cycle. Thus, photoreduction clearly competes with thermal oxidation, with Hg<jats:sup>0<\/jats:sup> being the main photoproduct of Hg<jats:sup>II<\/jats:sup> photolysis in the atmosphere, which significantly increases the lifetime of this metal in the environment.<\/jats:p>","DOI":"10.1002\/anie.201915656","type":"journal-article","created":{"date-parts":[[2019,12,13]],"date-time":"2019-12-13T02:45:08Z","timestamp":1576205108000},"page":"7605-7610","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":61,"title":["Photodissociation Mechanisms of Major Mercury(II) Species in the Atmospheric Chemical Cycle of Mercury"],"prefix":"10.1002","volume":"59","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-8232-4989","authenticated-orcid":false,"given":"Antonio","family":"Franc\u00e9s\u2010Monerris","sequence":"first","affiliation":[{"name":"Universit\u00e9 de Lorraine CNRS, LPCT  54000 Nancy France"},{"name":"Departamento de Qu\u00edmica F\u00edsica Universitat de Val\u00e8ncia  46100 Burjassot Spain"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Javier","family":"Carmona\u2010Garc\u00eda","sequence":"additional","affiliation":[{"name":"Institut de Ci\u00e8ncia Molecular Universitat de Val\u00e8ncia  46071 Val\u00e8ncia Spain"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"A. 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