Dr. Mariana Verezhak

Mariana Verezhak

I-TOMCAT adjunct scientist

Paul Scherrer Institute
Forschungsstrasse 111
5232 Villigen PSI

Dr. Mariana Verezhak graduated from Kyiv Polytechnic Institute (Ukraine) with a BSc degree and qualification of Engineer in Materials Science. She then simultaneously obtained her MSc degree from Kyiv Polytechnic Institute and Rennes University (France), participating in the MaMaSELF Erasmus Mundus Program (master in Materials Science exploring large-scale facilities). She has undertaken several scientific internships: conducting first principles studies of graphene/metal interfaces at the National Institute for Materials Science of Japan; studying Si/Metal thin films by secondary neutral mass spectroscopy and atomic probe tomography at University of Debrecen (Hungary); and performed Inelastic neutron and X-ray scattering investigations of quasicrystal phason modes at the Institute of Physics of Rennes (France), thanks to various research grants she obtained. With the nanoscience foundation grant, she completed her PhD at the Laboratory of Interdisciplinary Physics of Grenoble, while occupying a position of visiting scientist at the ESRF, ID13 beamline. During her PhD she studied bone tissue at multi-length scales via coherent diffraction imaging, ptychography, small-angle X-ray scattering and transmission electron microscopy. Between 2017 and 2021, she was a post-doc at Paul Scherrer Institute, cSAXS beamline, thanks to the PSI Fellow Marie Curie and European Union's Horizon 2020 grant. She was responsible for user support at the beamline, and has developed ptychographic topography, a novel high-resolution strain imaging technique, as well as continuing her investigations of bone tissue by correlative study with small angle X-ray scattering tensor tomography and ptychographic tomography. Dr. Mariana Verezhak joined the X-ray Tomography Group in September 2021 as I-TOMCAT adjunct scientist. She develops innovative imaging applications within TOMCAT 2.0 upgrade program and performs user support.


  • Rodriguez-Fernandez A, Diaz A, Iyer AHS, Verezhak M, Wakonig K, Colliander MH, et al.
    Imaging ultrafast dynamical diffraction wave fronts in strained Si with coherent X rays
    Physical Review Letters. 2021; 127(15): 157402 (7 pp.). https://doi.org/10.1103/PhysRevLett.127.157402
  • Verezhak M, Van Petegem S, Rodriguez-Fernandez A, Godard P, Wakonig K, Karpov D, et al.
    X-ray ptychographic topography: a robust nondestructive tool for strain imaging
    Physical Review B. 2021; 103(14): 144107 (9 pp.). https://doi.org/10.1103/PhysRevB.103.144107
  • Holler M, Ihli J, Tsai EHR, Nudelman F, Verezhak M, van de Berg WDJ, et al.
    A lathe system for micrometre-sized cylindrical sample preparation at room and cryogenic temperatures
    Journal of Synchrotron Radiation. 2020; 27(2): 472-476. https://doi.org/10.1107/S1600577519017028
  • Jørgensen PS, Fevola G, Verezhak M, Slyamov A, Crovetto A, Balogh ZI, et al.
    Resonant x-ray ptychographic nanotomography of kesterite solar cells
    Physical Review Research. 2020; 2(1): 013378 (12 pp.). https://doi.org/10.1103/PhysRevResearch.2.013378
  • Le Cann S, Törnquist E, Silva Barreto I, Fraulob M, Albini Lomami H, Verezhak M, et al.
    Spatio-temporal evolution of hydroxyapatite crystal thickness at the bone-implant interface
    Acta Biomaterialia. 2020; 116: 391-399. https://doi.org/10.1016/j.actbio.2020.09.021
  • Maldanis L, Hickman-Lewis K, Verezhak M, Gueriau P, Guizar-Sicairos M, Jaqueto P, et al.
    Nanoscale 3D quantitative imaging of 1.88 Ga Gunflint microfossils reveals novel insights into taphonomic and biogenic characters
    Scientific Reports. 2020; 10: 8163 (9 pp.). https://doi.org/10.1038/s41598-020-65176-w
  • Mariette C, Guérin L, Rabiller P, Odin C, Verezhak M, Bosak A, et al.
    High spatial resolution studies of phase transitions within organic aperiodic crystals
    Physical Review B. 2020; 101(18): 184107 (7 pp.). https://doi.org/10.1103/PhysRevB.101.184107
  • Müller S, Lippuner M, Verezhak M, De Andrade V, De Carlo F, Wood V
    Multimodal nanoscale tomographic imaging for battery electrodes
    Advanced Energy Materials. 2020; 10(28): 1904119 (8 pp.). https://doi.org/10.1002/aenm.201904119
  • Ecolivet C, Verezhak M, Mariette C, Guérin L, Rabiller P, Ollivier J, et al.
    Phonons in an aperiodic alkane/urea composite crystal studied by inelastic x-ray scattering
    Physical Review B. 2018; 98(22): 224308 (10 pp.). https://doi.org/10.1103/PhysRevB.98.224308
  • Plazanet M, Tasseva J, Bartolini P, Taschin A, Torre R, Combes C, et al.
    Time-domain THz spectroscopy of the characteristics of hydroxyapatite provides a signature of heating in bone tissue
    PLoS One. 2018; 13(8): e0201745 (16 pp.). https://doi.org/10.1371/journal.pone.0201745
  • Sadat T, Verezhak M, Godard P, Renault PO, Van Petegem S, Jacques V, et al.
    Plastic deformation of Insb micro-pillars: a comparative study between spatially resolved Laue and monochromatic X-Ray micro-diffraction maps
    In: Seefeldt M, ed. Residual stresses 2018. Vol. 6. Materials research proceedings. Millersville, USA: Materials Research Forum LLC.; 2018:21-26. https://doi.org/10.21741/9781945291890-4
  • Verezhak M, Rauch EF, Véron M, Lancelon-Pin C, Putaux J-L, Plazanet M, et al.
    Ultrafine heat-induced structural perturbations of bone mineral at the individual nanocrystal level
    Acta Biomaterialia. 2018; 73: 500-508. https://doi.org/10.1016/j.actbio.2018.04.004
  • Verezhak M, Van Petegem S, Jacques V, Godard P, Wakonig K, Thilly L, et al.
    Visualization of crystallographic defects in InSb micropillars by ptychographic topography
    Microscopy and Microanalysis. 2018; 24(Suppl. 2): 18-19. https://doi.org/10.1017/S1431927618012527