TY - JOUR
T1 - Indexing grazing-incidence X-ray diffraction patterns of thin films: lattices of higher symmetry
AU - Simbrunner, Josef
AU - Hofer, Sebastian
AU - Schrode, Benedikt
AU - Garmshausen, Yves
AU - Hecht, Stefan
AU - Resel, Roland
AU - Salzmann, Ingo
PY - 2019
Y1 - 2019
N2 - Grazing-incidence X-ray diffraction studies on organic thin films are often performed on systems showing fibre-textured growth. However, indexing their experimental diffraction patterns is generally challenging, especially if low-symmetry lattices are involved. Recently, analytical mathematical expressions for indexing experimental diffraction patterns of triclinic lattices were provided. In the present work, the corresponding formalism for crystal lattices of higher symmetry is given and procedures for applying these equations for indexing experimental data are described. Two examples are presented to demonstrate the feasibility of the indexing method. For layered crystals of the prototypical organic semiconductors diindenoperylene and (ortho-difluoro)sexiphenyl, as grown on highly oriented pyrolytic graphite, their yet unknown unit-cell parameters are determined and their crystallographic lattices are identified as monoclinic and orthorhombic, respectively.
AB - Grazing-incidence X-ray diffraction studies on organic thin films are often performed on systems showing fibre-textured growth. However, indexing their experimental diffraction patterns is generally challenging, especially if low-symmetry lattices are involved. Recently, analytical mathematical expressions for indexing experimental diffraction patterns of triclinic lattices were provided. In the present work, the corresponding formalism for crystal lattices of higher symmetry is given and procedures for applying these equations for indexing experimental data are described. Two examples are presented to demonstrate the feasibility of the indexing method. For layered crystals of the prototypical organic semiconductors diindenoperylene and (ortho-difluoro)sexiphenyl, as grown on highly oriented pyrolytic graphite, their yet unknown unit-cell parameters are determined and their crystallographic lattices are identified as monoclinic and orthorhombic, respectively.
U2 - 10.1107/S1600576719003029
DO - 10.1107/S1600576719003029
M3 - Article
SN - 0021-8898
VL - 52
SP - 428
EP - 439
JO - Journal of Applied Crystallography
JF - Journal of Applied Crystallography
ER -