小角散射 λ d sin0 2sin O 2d Small-Angle Supramolecular Envelope λ=1.54Ad=2.5A0=18 Bragg's law: λ=1.54Ad=5A0=9° sin0=λ/2d λ=1.54Ad=10A0=4.5° small 0 large d large e small d 1=1.54Ad=20A0=2.2° Wide-Angle-Atomic/Molecular Lattice 材料科学与工程学院 21 School of Materials Science and Engineering材料科学与工程学院 School of Materials Science and Engineering 小角散射 21 d d 2 , sin 2sin        = 1.54 Å d = 2.5Å  = 18  = 1.54 Å d = 5 Å  = 9  = 1.54 Å d = 10Å  = 4.5  = 1.54 Å d = 20Å  = 2.2