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. 2019 Jul 10;9:10002. doi: 10.1038/s41598-019-46449-5

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© The Author(s) 2019

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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(a) Distribution of the angle between the HB vector and the field-direction/orthogonal field-direction (red bars/blue bars). The definitions of the HB vector and the angles are depicted in the illustration on the right. (b) Normalized histogram of HB lengths resolved by the angle between the electric field and the HB vector (the red bars in (a)). The vertical red lines indicate the average HB length in each case. Left: 300–500 fs (average = 2.88 Å), middle: 1500–2000 fs (average = 2.94 Å), right: equilibrium microcanonical distribution for comparison (average = 2.88 Å).