1. Wood Technology and Wood ChemistryGeorg‐August‐University of Göttingen Büsgenweg 4 D‐37077 Göttingen Germany
2. Third Institute of Physics‐BiophysicsFaculty of PhysicsGeorg‐August‐University of Göttingen Friedrich‐Hund‐Platz 1 D‐37077 Göttingen Germany
3. State Key Laboratory of Pulp and Paper EngineeringSouth China University of Technology Guangzhou 510640 China