Recently interest in antimatter research has increased as facilities such as CERN have succeeded in trapping antimatter atoms to study their properties [1]. Theoretical treatment of antimatter collisions is needed in order to understand how it is destroyed by interacting with normal matter and thus to allow better trapping techniques to be developed [2]. There is also a growing interest in chemical reactions involving antimatter including the relatively long-lived antiprotonic helium system [3].
This project will investigate interactions between antimatter and ordinary matter. The work will include development of high performance computer software and calculation of potential energies of interaction for a number of key systems in antimatter research including H2 + antihydrogen atom. These potential energy surfaces (PESs) will then be used to calculate rovibrational bound states and reactive and non-reactive scattering properties. Specifically, the bound state energies and wavefunctions for these systems allow prediction and understanding of spectroscopic properties, for example energy levels and lifetimes of states. Reactive scattering results, for which current literature is sparse, give the rates of processes such as
H2 + antihydrogen atom → Pn + Ps + H
which destroy antimatter by breaking up antiatoms and eventual annihilation of the proton-antiproton and electron-positron pairs in Pn and Ps respectively.
H2 + antihydrogen atom is a high priority system for the work at CERN along with charged variants such as H2+ + antiproton. The prototype molecule-antimolecule system H2 + antihydrogen molecule will also be tackled using techniques developed for simpler systems.
The project will make use of state of the art quantum chemistry techniques to calculate reaction rates as well as highly excited vibration-rotation energy levels. Computer programs developed for this project may also be made use of by future research projects on matter-antimatter interactions involving more complex systems such as larger molecules.
The successful candidate will have or expect to have a UK Honours Degree at 2.1 (or equivalent) in Chemistry, Physics or Chemical Physics.
A strong background in physical chemistry or physics or chemical physics, including experience of: atomic structure and chemical bonding and their description by quantum mechanics; basic principles of the quantum mechanical treatments of molecular electronic, vibrational and rotational motions.
Proficiency in basic calculus and algebra: differential and integral calculus of a single variable; complex numbers and the theory of polynomial equations, vector algebra in two and three dimensions, systems of linear equations and their solution, matrices and determinants.
Knowledge of, or aptitude for learning: advanced mathematical topics (calculus of several variables, group theory, eigenvalue equations); basic computer programming (for example Fortran) and modern techniques for molecular electronic structure determination (for example ab initio or Monte Carlo methods).
APPLICATION PROCEDURE:
This project is advertised in relation to the research areas of the discipline of Chemistry. Formal applications can be completed online:
https://www.abdn.ac.uk/pgap/login.php You should apply for Degree of Doctor of Philosophy in Chemistry, to ensure that your application is passed to the correct person for processing. NOTE CLEARLY THE NAME OF THE SUPERVISOR and EXACT PROJECT TITLE ON THE APPLICATION FORM.
Informal inquiries can be made to Dr M Law (
[email protected]) with a copy of your curriculum vitae and cover letter indicating your interest in the project and why you wish to undertake it. All general enquiries should be directed to the Postgraduate Research School (
[email protected]).
References
[1] "Confinement of antihydrogen for 1,000 seconds", G. B. Andresen, M. D. Ashkezari, M. Baquero-Ruiz et al. (ALPHA Collaboration) Nature Physics, 7, 558 (2011).
[2] "Helium-antihydrogen scattering at low energies", S. Jonsell, E. A. G. Armour, Y. Liu, M. Plummer and A. C. Todd, New Journal of Physics, 14, 035013 (2012).
[3] Physics at CERN’s Antiproton Decelerator. Prog. Part. Nucl. Phys., M. Hori and J. Walz, 72, 206, (2013).