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. 2020 Apr 21;10:6695. doi: 10.1038/s41598-020-63481-y

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© The Author(s) 2020

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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Infrared spectra of the gases evolving during the 1^st decomposition stage. From top to bottom (blue – green – red): (a) spectra at 16.1 min and at 19.5 min as well as reference spectrum of isocyanic acid (HNCO); (b) spectrum at 22.3 min and reference spectra of carbon dioxide (CO₂) and ammonia (NH₃). The water spectrum was subtracted from the measured spectra.