PhD position in VUV photoionization spectroscopy in Paris-Saclay, France, in collaboration with Paul Scherrer Institute, Switzerland (Deadline: 23.02.2026)

We are pleased to announce a PhD opportunity (COFUND LIGHT in Paris) in photoionization spectroscopy of species pertinent in interstellar chemistry and combustion reactions, based at the Institute of Molecular Science in Orsay (ISMO), University of Paris-Saclay, France under the direction of Séverine Boyé-Péronne and Bérenger Gans.

The PhD project, “ Combined Laser And Synchrotron pHotoelectron studies to assess the rovibronic structure of cations (CLASH)”, exploits state-of-the-art tunable VUV radiation sources—including a fourth-generation synchrotron and a pulsed VUV laser—combined with advanced photoelectron spectroscopic techniques to achieve real-time, in situ identification of gas-phase reactive species relevant to the interstellar medium and combustion processes.

The fellow will spend 2 years at ISMO (France) performing high-resolution laser technique, and 1 year at the Paul Scherrer Institute (Switzerland) carrying on synchrotron-based measurements at the VUV PSI synchrotron beamline under the supervision of Prof. Patrick Kemberger. The molecular constants derived from these complementary investigations will be incorporated into molecular databases such as PEPISCO database and further used to predict or validate the models for combustion reaction networks or chemistry of the interstellar medium.

Eligibility criteria:
There is no restriction on the nationality of the candidate, but they must fulfill the Marie Skłodowska-Curie Actions (MSCA) criteria for • the PhD qualification: obtained a Master’s degree or equivalent by 23 February 2026, or completed coursework with diploma awarded by 01/10/2026
• transnational mobility: Must not have spent more than 12 months in France during the 36 months prior to the call deadline
Additional criteria and details about the application procedure and document are available on the project website (https://lightinparis.eu/).

Required background:
• Molecular physics, physical chemistry, or a related field
• Theoretical and experimental knowledge in optics
• Master’s degree in Physics, Chemistry, or a related discipline

Additional experience (preferred):
• Experimental spectroscopic techniques
• Experience working with lasers

Application materials:
• Detailed CV
• Cover letter
• Contact details of two referees

Timeline:
• Call opens: 16 December 2025
• Application deadline: 23 February 2026 (23:59 Paris time)
• Interviews: April–May 2026
• Results: April–May 2026

Position details:
• Start date: between 1 October and 1 December 2026
• Duration: 3 years (2 years in France + 1 year abroad)
• Salary: approximately €2400/month, including mobility (€50) and travel (€150) allowances
• Additional benefits include a dedicated training program, residential school, and an excellent international research environment.

Full project details:
https://cirrus.universite-paris-saclay.fr/s/zQfjyqegQzMrpee
General call information:
https://lightinparis.eu/
For further information, please contact: severine.boye-peronne@universite-paris-saclay.fr or patrick.hemberger@psi.ch