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HCN can be produced during impact events by reprocessing of carbonaceous and nitrogenous materials from both the impactor and the atmosphere; it can also be produced from these materials by electrical discharge. Here we investigate the effect of high energy events on a range of starting mixtures representative of various atmosphere-impactor volatile combinations. Using continuously scanning time\u2013resolved spectrometry, we have detected \u00b7CN radical and excited CO as the initially most abundant products. Cyano radicals and excited carbon monoxide molecules in particular are reactive, energy-rich species, but are resilient owing to favourable Franck\u2013Condon factors. The subsequent reactions of these first formed excited species lead to the production of ground-state prebiotic building blocks, principally HCN.<\/jats:p>","DOI":"10.1038\/s41598-017-06489-1","type":"journal-article","created":{"date-parts":[[2017,7,18]],"date-time":"2017-07-18T11:22:57Z","timestamp":1500376977000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":97,"title":["High Energy Radical Chemistry Formation of HCN-rich Atmospheres on early Earth"],"prefix":"10.1038","volume":"7","author":[{"given":"Martin","family":"Ferus","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Petr","family":"Kubel\u00edk","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Anton\u00edn","family":"Kn\u00ed\u017eek","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Adam","family":"Pastorek","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"John","family":"Sutherland","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Svatopluk","family":"Civi\u0161","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"297","published-online":{"date-parts":[[2017,7,24]]},"reference":[{"key":"6489_CR1","doi-asserted-by":"crossref","unstructured":"McCollom, T. 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