Probing Astrochemical Reactions with Laser Spectroscopy

The study of chemistry occurring in low temperature environments, such as those in the interstellar medium, is an excellent test of our understanding of the governing forces in molecular interactions and reactive collisions. Because of long range attractive forces, ions and radical neutral molecules should drive the gas phase reaction landscape in low temperature, low pressure environments, such as those relevant to areas of the interstellar medium (ISM). But what are the products from these reactions? Does the product branching ratio change as a function of temperature?

This project focuses on using a combination of laser techniques to probe astrochemically relevant chemical reaction kinetics at low temperatures. You will work within the Lehman research group (https://lehmanresearchgroup.wordpress.com) and use a state-of-the-art frequency comb laser spectrometer coupled to a molecular flow in order to measure reaction rate coefficients as a function of temperature. You will collect reaction rate information simultaneously with high resolution infrared spectra, resulting in a wealth of information about the identity and reactivity of targeted organosulfur molecules. Your experimental work will be supported by spectral simulations, ab initio calculations, and simulations of the reaction kinetics under a variety of temperature and pressure conditions.

This is a well-rounded PhD studentship, during which you will receive a wide range of training, for example in communication skills, project management, and technical aspects (such as vibrational absorption spectroscopy, kinetic methods, high-resolution laser-based spectroscopic techniques, optics, vacuum systems, and quantum chemical calculations). You will also receive training in writing and implementing computer-controlled data acquisition and analysis programs. The successful PhD student will have access to a broad spectrum of training workshops that include managing your degree and preparing for your viva, and support to attend both national and international conferences.

Funding notes:

Funding for this position is open to UK applicants and the 3.5 years studentship will start in October 2024. Stipend and fees are funded at standard EPSRC rates.