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. 2019 Apr 3;7:191. doi: 10.3389/fchem.2019.00191

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Copyright © 2019 Canaval, Hyttinen, Schmidbauer, Fischer and Hansel.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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The reaction enthalpy ΔH_r of the reaction $N H_{4}^{+} A \to A H^{+} + N H_{3}$ , where A is a monoterpene, shows a good correlation with the ${NH}_{4}^{+}$ -A cluster ion yield.