Aarhus University

What you'll study

The PhD is a research-led programme focused on time-resolved studies of chemical and material systems using femtosecond optical lasers and X-ray free-electron lasers. Project work typically centres on pump–probe spectroscopy and scattering experiments that resolve structural and electronic changes on femtosecond to picosecond timescales.

• Ultrafast laser techniques: femtosecond pulse generation and characterisation, nonlinear optics, pulse shaping, and optical pump–probe methods.
• XFEL and synchrotron methods: time-resolved X-ray scattering and diffraction, X-ray absorption and emission spectroscopy, serial femtosecond crystallography, and experiment design at large-scale facilities.
• Sample delivery and instrumentation: liquid jets, aerosol/particle injection, cryo- and room-temperature sample environments, timing diagnostics, and detector technology.
• Data analysis and modelling: reduction of time-resolved X-ray data, singular value decomposition, global analysis, molecular dynamics and quantum-chemical modelling to interpret structural dynamics.
• Complementary training: statistical data handling, programming for data acquisition and analysis (e.g. Python/Matlab), scientific communication, and research ethics.

Programme structure follows a standard PhD format, with a primary research project supervised by academic staff, periodic progress evaluations, participation in group meetings and seminars, and opportunities to undertake short research stays at national/international XFEL or synchrotron facilities. Depending on the project, candidates often split time between laboratory development, beamline experiments, and computational interpretation.

Entry requirements

Applicants should hold a relevant Master’s degree (or equivalent) in chemistry, chemical physics, physical chemistry, physics, photonics or a closely related discipline. A strong academic record in physical chemistry, spectroscopy, quantum chemistry or experimental physics is expected.

• Practical experience with lasers, ultrafast spectroscopy, X‑ray methods, vacuum systems or advanced instrumentation is highly desirable.
• Good programming or data-analysis skills (Python, MATLAB, C++ or similar) are advantageous.
• Evidence of research potential such as publications, project reports or references from supervisors is required.
• Applicants whose native language is not English must demonstrate English proficiency according to the university’s general PhD admission requirements.
• Selection typically involves evaluation of the CV, transcripts, a research statement or motivation letter, and references; shortlisted candidates may be interviewed by the prospective supervisors.

Career prospects

Graduates from this field are well placed for careers that require advanced experimental and analytical skills in time-resolved techniques and X-ray science. Typical pathways include:

• Academic research: postdoctoral positions and faculty track roles in ultrafast spectroscopy, chemical dynamics, structural biology and materials science.
• Large-scale facility science: beamline scientists or instrument scientists at XFELs, synchrotrons and neutron sources.
• R&D in industry: roles in pharmaceuticals, materials, energy, and instrumentation companies developing detectors, lasers, or sample delivery systems.
• Scientific software and data science: positions focused on big-data handling, analysis pipelines, and modelling of time-resolved experiments.
• Science management and policy: research leadership, facility management, and roles in funding agencies or technology transfer.

Why study at Aarhus University

Aarhus University offers a collaborative environment bridging chemistry, physics and engineering, with strong groups in physical chemistry, ultrafast science and instrumentation. Students benefit from access to in-house laser laboratories and close links to international XFEL and synchrotron facilities, enabling beamtime collaborations and short-term placements at major light sources in the Nordic and European research infrastructure.

Doctoral candidates join an international research community with structured PhD supervision, training courses, and opportunities to present at conferences and summer schools. The department emphasises hands-on experimental training combined with computational interpretation, preparing graduates for both academic and industry careers in cutting-edge time-resolved X-ray science.