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This interesting and yet not fully understood phenomenon is called polyamorphism, and notable examples include water, SiO\n                    <jats:sub>2<\/jats:sub>\n                    , Si, etc. Here we present an example of such behavior in a simple molecular substance, SO\n                    <jats:sub>2<\/jats:sub>\n                    . By using experimental high-pressure techniques, we observe a reversible transition between different amorphous states around 26 GPa. Experimental results are well supported by ab initio simulations, which identify the high-pressure amorphous form as a nonmolecular, polymeric one consisting of intertwined chains. Our findings contribute to the fundamental understanding of structure of disordered matter as well as high-pressure behavior of simple archetypal molecules.\n                  <\/jats:p>","DOI":"10.1073\/pnas.1917749117","type":"journal-article","created":{"date-parts":[[2020,4,3]],"date-time":"2020-04-03T19:16:04Z","timestamp":1585941364000},"page":"8736-8742","update-policy":"https:\/\/doi.org\/10.1073\/pnas.cm10313","source":"Crossref","is-referenced-by-count":25,"title":["Pressure-induced amorphization and existence of molecular and polymeric amorphous forms in dense SO\n                    <sub>2<\/sub>"],"prefix":"10.1073","volume":"117","author":[{"given":"Huichao","family":"Zhang","sequence":"first","affiliation":[{"name":"Key Laboratory of Materials Physics, Institute of Solid State Physics, Chinese Academy of Sciences, Hefei 230031, China;"},{"name":"University of Science and Technology of China, Hefei 230026, China;"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Ondrej","family":"T\u00f3th","sequence":"additional","affiliation":[{"name":"Department of Experimental Physics, Faculty of Mathematics, Physics and Informatics, Comenius University, 842 48 Bratislava, Slovakia;"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-0067-7244","authenticated-orcid":false,"given":"Xiao-Di","family":"Liu","sequence":"additional","affiliation":[{"name":"Key Laboratory of Materials Physics, Institute of Solid State Physics, Chinese Academy of Sciences, Hefei 230031, China;"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-6746-696X","authenticated-orcid":false,"given":"Roberto","family":"Bini","sequence":"additional","affiliation":[{"name":"Department of Chemistry, University of Florence, 50121 Florence, Italy;"},{"name":"European Laboratory for Non-Linear Spectroscopy, 50019 Sesto Fiorentino, Italy;"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Eugene","family":"Gregoryanz","sequence":"additional","affiliation":[{"name":"Key Laboratory of Materials Physics, Institute of Solid State Physics, Chinese Academy of Sciences, Hefei 230031, China;"},{"name":"School of Physics and Astronomy, University of Edinburgh, Edinburgh EH9 3JZ, United Kingdom;"},{"name":"Centre for Science at Extreme Conditions, University of Edinburgh, Edinburgh EH9 3JZ, United Kingdom;"},{"name":"Center for High Pressure Science Technology Advanced Research, Shanghai, 201203, China;"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Philip","family":"Dalladay-Simpson","sequence":"additional","affiliation":[{"name":"Center for High Pressure Science Technology Advanced Research, Shanghai, 201203, China;"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-9428-079X","authenticated-orcid":false,"given":"Simone","family":"De Panfilis","sequence":"additional","affiliation":[{"name":"Centre for Life Nano Science, Istituto Italiano di Tecnologia, 00161 Rome, Italy;"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Mario","family":"Santoro","sequence":"additional","affiliation":[{"name":"Key Laboratory of Materials Physics, Institute of Solid State Physics, Chinese Academy of Sciences, Hefei 230031, China;"},{"name":"European Laboratory for Non-Linear Spectroscopy, 50019 Sesto Fiorentino, Italy;"},{"name":"Istituto Nazionale di Ottica, Consiglio Nazionale delle Ricerche (CNR-INO), 50125 Florence, Italy"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Federico Aiace","family":"Gorelli","sequence":"additional","affiliation":[{"name":"Key Laboratory of Materials Physics, Institute of Solid State Physics, Chinese Academy of Sciences, Hefei 230031, China;"},{"name":"European Laboratory for Non-Linear Spectroscopy, 50019 Sesto Fiorentino, Italy;"},{"name":"Istituto Nazionale di Ottica, Consiglio Nazionale delle Ricerche (CNR-INO), 50125 Florence, Italy"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-4013-9117","authenticated-orcid":false,"given":"Roman","family":"Marto\u0148\u00e1k","sequence":"additional","affiliation":[{"name":"Department of Experimental Physics, Faculty of Mathematics, Physics and Informatics, Comenius University, 842 48 Bratislava, Slovakia;"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"341","published-online":{"date-parts":[[2020,4,3]]},"reference":[{"key":"e_1_3_3_1_2","doi-asserted-by":"publisher","DOI":"10.1126\/science.275.5298.322"},{"key":"e_1_3_3_2_2","doi-asserted-by":"publisher","DOI":"10.1039\/b401308p"},{"key":"e_1_3_3_3_2","doi-asserted-by":"publisher","DOI":"10.1016\/j.pmatsci.2013.12.002"},{"key":"e_1_3_3_4_2","first-page":"011004","article-title":"Thermodynamics of fluid polyamorphism","volume":"8","author":"Anisimov M. 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