PhD Studentship: Cold Chemistry with Rydberg Atoms

Ion-molecule reactions are an exotic class of chemical reactions because they can proceed very efficiently even at absolute zero temperature. These reactions are believed to drive complex reaction chains in the cold and dilute regions of the interstellar medium (ISM). Additionally, ion-molecule reactions present an ideal platform to study cold and controlled chemistry in the gas phase and gain insights about the effects that quantum mechanics play on the reactivity at the lowest temperatures. Experimentally, it is challenging to reach the low-energy regime where these quantum mechanical effects have been predicted by theory to become prominent. The reason for this is that bare ions are easily accelerated and "heated" by stray electric fields which are ubiquitous in the laboratory. A new experimental method has been developed recently whereby previously inaccessible low temperatures can be reached by substituting the ions with atoms or molecules excited to Rydberg states (states of high principal quantum number). The proposed project will exploit this approach to study cold reactive collisions in different low-temperature regimes.

About the role

Applications are invited for a PhD student to join the team of Dr. Valentina Zhelyazkova at the Physics and Astronomy Department of University College London. The studentship is fully funded for four years as part of a Royal Society University Research Fellowship. 

The project will be focussed on building a new experiment aimed at studying gas-phase ion-molecule reactions at cold and ultracold temperatures and low energies by using Rydberg species and suitably chosen few-atom molecules. The goal is to reach unprecedentedly low collision energies, study reactions with quantum-state-prepared molecules, and manipulate the reactivity with external fields.

We are seeking a highly motivated individual, passionate about quantum physics and chemistry, with an ability to think creatively and critically. Experience with laser optics and vacuum systems is advantageous but not essential.

About you

The ideal candidate will meet the following criteria:

• Holding or expecting to hold a first- or upper second-class undergraduate degree (or equivalent) in Physics, Chemistry, Engineering  or a related discipline. A master's degree is a plus.
• “Hands-on” laboratory experience and/or skills, interest in electronics.
• Excellent programming skills.
• Willingness to develop theory and simulations.

Eligibility & Award Value

• This studentship is open to both home (UK) and international students but only covers university fees at the home student rate. International applicants are encouraged to apply for external funding schemes to cover the fee difference.

Applications should include:

• A cover letter
• A statement of research interests and experience
• Curriculum Vitae
• Two letters of recommendation 
• An academic transcript to date

For informal enquires contact Dr. Valentina Zhelyazkova at valentina.zhelyazkova@ucl.ac.uk. You could also apply directly through the central UCL system at:

https://www.ucl.ac.uk/prospective-students/graduate/research-degrees/applying-graduate-research-study-ucl

Applications received by 31.01.2025 will be given full consideration.

Our commitment to Equality, Diversity and Inclusion

UCL is committed to providing equal opportunities, fostering inclusivity and mutual respect, and creating a place where everyone feels welcome. We encourage applications from under-represented candidates in the physical sciences: women, people from Black and ethnic minority backgrounds, people with disabilities, and members of the LGBTQI+ community.

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