University of Connecticut

Events Calendar

Atomic, Molecular, and Optical Physics Seminar

Tuesday, July 25, 2017
2:00pm – 3:00pm

Storrs Campus
Physics Building, P121

Brendan McLaughlin, Centre for Theoretical Atomic and Molecular Physics, School of Mathematics and Physics, Queen’s University Belfast

Quantum Chemistry and its role in dynamical studies and ultra-cold collisions

The structure and properties of molecules and their cations plays a fundamental role in a range of dynamical studies such as; ultra-cold collisions [1,2,3], laser cooling and trapping, dissociative electron attachment, dissociative recombination, electron scattering, photoionization [4] and ultrafast dynamics [5]. Ultra-cold hybrid ion-atom traps offer the possibility of microscopic manipulation of quantum coherence in the gas using the ion as a probe. Inelastic processes, particularly charge transfer can be a significant process of ion loss and is of current interest experimentally. The study of ultra-cold molecules tightly trapped in an optical lattice can expand the frontier of precision measurements and spectroscopy and lead to a deeper insight into molecular and fundamental physics. The interpretation of experimental results requires detailed information on the structure, properties and dynamics and is a prime example where quantum chemistry plays a fundamental role. Electron-density distributions, transition dipole moments and potential-energy surfaces are important for predicting the physical properties and chemical reactivity of molecular systems. I will briefly review the methods used to obtain the structure and dynamics of molecular systems and show how such information can be used in various theoretical studies for a variety of molecular complexes. I will highlight the fundamental role played by quantum chemistry in all of these present investigations and present recent dynamical results for cross sections and rate coefficients for radiative loss, association and charge transfer for a variety of diatomic complexes, namely; NaCa+, HeC+. CH+, CH, SiO and CS [5-8]. Many of these systems are of current interest to the theoretical and experimental efforts of the University of Connecticut, Storrs group.

References

[1] H D L Lamb, J F McCann, B M McLaughlin, J Goold, N Wells and I C Lane, Phys. Rev A 86, 022719 (2012)

[2] B M McLaughlin, H D L Lamb, I C Lane and J F McCann, J. Phys. B: At. Mol. Opt. Phys. 47, 145201 (2014)

[3] P C Stancil, G Shen, J F McCann and B M McLaughlin, Bull. Am. Phys. Soc. 59, 46 (2014)

[4] G Shen, P C Stancil, J G Wang, J F McCann and B M McLaughlin, J. Phys. B: At. Mol. Phys. 48, 105203 (2015)

[5] J. F. Babb and B M McLaughlin, J. Phys. B: At. Mol. Opt. Phys. 50, 044003 (2017)

[6] J. F. Babb and B. M. McLaughlin, MNRAS 468, 2052(2017)

[7] J. F. Babb, H. Merryman and B. M. McLaughlin, MNRAS, in press (2017).

[7] M. Cairnie, R. C. Forrey, J. F. Babb, P. C. Stancil and B. M. McLaughlin, MNRAS, in press (2017)

[8]R. Patillo, R. Cieszewski, P. C. Stancil, R. C. Forrey, J. F. Babb, J. F. McCann and B. M. McLaughlin, Astrophys. J, in press (2017).

Contact:

Prof. Phillip Gould

Physics Department (primary), UConn Master Calendar

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