People

Martin Beye Group leader
SU page | Email | ORCID

• Studied Physics in Hamburg and received his PhD in 2010 with ultrafast X-ray spectroscopy on solids

• Postdoc at Helmholtz-Zentrum Berlin, Germany and SLAC, Stanford, USA working with A. Föhlisch and A. Nilsson

• Fellow of the Volkswagen Stiftung in Berlin and Stanford for real-time X-ray studies of chemical reactions

• Helmholtz young investigator group leader at FLASH, DESY, Hamburg, Germany from 2016 on for the development of non-linear X-ray methods

• Acting scientific head of FLASH 2019-2022 at DESY, Hamburg, Germany

• Professor of Chemical Physics at Stockholm University since 2023

• Makes music, rides his bike, and plays with his daughter in his free time
  

David Degerman Postdoc
SU page | Email | ORCID | Google Scholar | LinkedIn

• Postdoc since February 2026

• PhD in Chemical Physics 2023, MSc in Materials Chemistry 2015 at Stockholm University

• Researches heterogenous catalyst mechanisms using operando X-ray spectroscopy

• Develops instruments for time-resolved photoemission spectroscopy at high pressure

• Hobby singer, pianist, rock climber, and Pokémon enthusiast
  

Jan Schunck Postdoc
SU page | Email | ORCID | Google Scholar | LinkedIn

• Postdoc since September 2025

• PhD in Physics at Deutsches Elektronen-Synchrotron (DESY), Germany in 2025

• Operando X-ray spectroscopy studies of spin-promotion effect of Haber-Bosch catalysts

• Investigation of quantum materials using novel soft X-ray spectroscopy methods

• Reads and explores Sweden’s nature with his children in his free time
  

Ragini Sengupta Postdoc
SU page | Email | ORCID

• Postdoc since February 2026

• PhD in Chemistry at Karlsruhe Institute of Technology, Germany in 2025

• Studied transition metal electrocatalysts using ex-situ/operando X-ray spectroscopies

• Working on the designs of new front cones for the POLARIS instrument at DESY

• Enjoys reading, cooking, and capturing sunsets whenever an opportunity presents itself!
  

Safiya Ahsan PhD student
SU page | Email | ORCID

• PhD student since September 2024

• MSc in Physical Chemistry 2022, MTech in Nanotechnology 2024 at Aligarh Muslim University, India

• Studies nanoscale domain fluctuations using XPCS

• Enjoys cooking and exploring new places in her free time
  

Anton Harrer PhD student
SU page | Email | ORCID

• PhD student since January 2025

• MSc in Chemistry at University Erlangen-Nürnberg, Germany in 2024

• Research of spin-order fluctuations using imaging and XPCS

• Studies of the Fischer-Tropsch process with POLARIS

• Reads, cooks, and climbs in his free time
  

HyoWon Seoh PhD student
SU page | Email

• PhD student since December 2025

• MSc in Physics at University of Seoul, South Korea in 2024

• Catalytic mechanism studies using in-situ/operando X-ray spectroscopy

• Enjoys reading, drawing, and sports in her free time
  

Hirad Salari PhD student
SU page | Email | ORCID

• PhD student since May 2024

• MSc in Materials Engineering at University of Tehran, Iran in 2022

• Operando characterization of electrocatalyst materials with X-ray spectroscopy

• Study of thermo-catalytic reactions at solid/gas interfaces

• Enjoys traveling, hiking in nature, and cooking
  

Associates

Ru-Pan Wang Postdoc at FLASH
Email

• Operating MUSIX/FLUXS end-station with Prof. Dr. Martin Beye (2020-2026)

• Soft X-ray spectroscopy (XAS and RIXS) in solid and liquid phases

• Charge transfer multiplet calculation
  

Simon Marotzke PhD student at DESY / Kiel University
Email

• PhD student at DESY/Kiel since March 2022; co-supervised by Prof. Martin Beye

• MSc in Physics at Hamburg University, Germany in 2021

• Soft X-ray investigations of quantum materials using spectroscopy/scattering techniques

• Time-resolved free-electron laser studies at FLASH (DESY) with MUSIX endstation

• Reads, dances, plays board games, and cello outside of the experimental hall

Fernando García Martínez Postdoc at DESY / PETRA III
Email | ORCID

• Expert in ambient pressure and operando research with photoemission and diffraction

• Focus on oxidation reactions (NO + CO, CO + O₂, NH₃ + O₂…)

• Interested in the dependence of chemical reactions on catalyst structure

• Plans to focus on experiment control

• Fan of hummus and Rachmaninoff
  

Former Members

Robin Yoël Engel Postdoc and PhD student (2018-2025)
Email

• Now working on a deeptech-startup for X-ray based semiconductor mapping @DESY

• Postdoc project: Catalytic methanol production for CO₂ mitigation

• PhD thesis: From Linear to Non-Linear X-ray Spectroscopy on Materials using SASE-FELs

• Enjoys archery, historical fencing, board- and PC-games, and tinkering