title: Single molecules reorientation reveals the dynamics of polymer glasses surface.
abstract: The polymer glass surface can be many orders of magnitude more mobile than the interior. We probe dynamics with reorientation of single dye molecules spin-coated onto polymer films. Rotation jumps in transition dipole orientation are observed for approximately 30% of all single molecules. It is found for the first time that there are mainly three typical jumping patterns of orientation: dithering jump, alternate jump and stepping jump patterns. The distribution of rotational correlation time are used to characterize the dynamics of polymer glass surfaces.
authors.affiliation: State Key Laboratory of Quantum Optics and Quantum Optics Devices, College of Physics and Electronics Engineering, Shanxi University, 030006, Taiyuan, China.
authors.forename: Guofeng
authors.initials: G
authors.lastname: Zhang
authors.forename: Liantuan
authors.initials: L
authors.lastname: Xiao
authors.forename: Fang
authors.initials: F
authors.lastname: Zhang
authors.forename: Xiaobo
authors.initials: X
authors.lastname: Wang
authors.forename: Suotang
authors.initials: S
authors.lastname: Jia
mesh_terms: D003503:Cyclobutanes / Q000737:chemistry*; D005456:Fluorescent Dyes / Q000737:chemistry*; D005898:Glass / Q000737:chemistry; D008567:Membranes, Artificial; D015394:Molecular Structure; D010636:Phenols / Q000737:chemistry*; D019904:Polymethyl Methacrylate / Q000737:chemistry*; D043862:Rotaxanes / Q000737:chemistry*; D013499:Surface Properties; D013816:Thermodynamics
chemical_list: D003503:Cyclobutanes; D005456:Fluorescent Dyes; D008567:Membranes, Artificial; D010636:Phenols; D043862:Rotaxanes; C480596:squaraine; D019904:Polymethyl Methacrylate