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. 2022 Mar 15;10:856591. doi: 10.3389/fbioe.2022.856591

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Copyright © 2022 Liu, Zhao, Li and Zhao.

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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Principle of Raman scattering. (A) Raman scattering and Rayleigh scattering. (B) Energy level diagram of Raman scattering, Rayleigh scattering and infrared absorption.