PhD: Simulating Interstellar Icy Grains in the Laboratory; The Open University, Milton Keynes, UK (Deadline: 31.03.2026)
PhD Opportunity: Simulating Interstellar Icy Grains in the Laboratory (at the Open University, UK)
We invite applications (UK and international) for a PhD project in the School of Physical Sciences at the Open University that probes the physical and chemical properties of interstellar ices – the molecular solids that drive chemical evolution in dense molecular clouds. With JWST now resolving subtle mid-infrared molecular absorption band profiles of astrophysical ices, there is a pressing need for laboratory data that disentangle intrinsic molecular structure from morphology‑ and size‑dependent optical effects.
Project focus
This project combines complementary experimental approaches to isolate and quantify the molecular‑level processes that shape interstellar ice spectra:
– Vapour‑deposited molecular ice films will be characterised using in situ IR spectroscopy and VUV spectroscopy to probe vibrational and electronic structure, mixture effects, and radiation‑driven chemistry under controlled conditions.
– Acoustically levitated icy aerosols will enable systematic variation of particle size and aggregation, allowing the separation of chemical signatures (bonding, composition, processing) from scattering‑driven distortions (Mie/Rayleigh regimes) that strongly influence astronomical band profiles.
Together, these datasets will provide the first laboratory‑based benchmarks capable of distinguishing chemical properties from grain‑scale scattering distortions in JWST ice spectra.
Training & research environment
The student will gain experience in cryogenic methods, acoustic levitation, IR/VUV spectroscopy, synchrotron beam time, and quantitative spectral analysis. The project sits at the interface of molecular physics, astrochemistry and atmospheric/aerosol science, with opportunities to collaborate with JWST observational astronomers.
Applicant profile
A 2:1 BSc or MSc in Physics, Chemistry, Astronomy or a related discipline is required; an integrated Master’s degree is ideal.
Further information
Full project description: https://university.open.ac.uk/science/physical-science/sites/www.open.ac.uk.science.physical-science/files/Simulating%20interstellar%20icy%20grains%20in%20the%20laboratory.pdf
Application process: https://university.open.ac.uk/science/physical-science/phd-students/current-phd-studentships
Contact (lead supervisor): Anita.Dawes@open.ac.uk
The closing date for applications is Tuesday 31st March.
