Loren Greenman
Associate Professor
308 Cardwell Hall
lgreenman@phys.ksu.edu
Group Webpage
Ph.D. University of Chicago, 2011
M.S. University of Chicago, 2007
B.S. Chemistry, University of Minnesota, 2006
B. Ch. En. Chemical Engineering, University of Minnesota, 2006
Research Area
Theoretical Atomic, Molecular & Optical Physics
My group is interested in describing the interactions of laser pulses with molecules. Laser pulses are getting shorter and more intense, allowing experimentalists to probe electronic and nuclear dynamics on their natural timescales. However, complex dynamics emerge at these timescales. Modern theories have difficulty describing non-adiabatic coupling, high-lying molecular excited states, and unbound electrons, especially for larger molecules. We have recently developed adaptive grid techniques to address some of these complications. We also develop and use modern electronic structure methods to describe these systems.
As the target molecules of laser experiments get larger, describing their complicated structure and dynamics becomes a greater challenge. Our methods are at the interface of AMO physics, modern quantum chemistry, and high performance computing. Distributed parallel computation drives our work and enables us to consider larger and more complex systems.
It is our ultimate goal to design and describe "molecular movies", dynamical laser experiments that record in real time the electron and nuclear motion and correlation in chemical processes. We hope to use these techniques to learn more about photochemical reactions, efficient conversion between photon energy (including solar) and chemical energy, and photon-driven biological processes.
Research Support
- Department of Energy
Graduate Advisees
- Muhammad Sakhi, PhD
- Josh Stallbaumer, PhD
Postdoctoral Advisees
- Saad Mehmood
- Paresh Modak
Recent Selected Publications
C. A. Marante, L. Greenman, C. S. Trevisan, T. N. Rescigno, C. W. McCurdy, and R. R. Lucchese, “Validity of the static-exchange approximation for inner-shell photoionization of polyatomic molecules”, Phys. Rev. A 102, 012815 (2020). [link]
R. E. Goetz, C. P. Koch, and L. Greenman, “Quantum control of photoelectron circular dichroism”, Phys. Rev. Lett. 122, 013204 (2019). [link]
E. G. Champenois, L. Greenman, N. Shivaram, J. P. Cryan, K. A. Larsen, T. N. Rescigno, C. W. McCurdy, A. Belkacem, and D. Slaughter, “Ultrafast photodissociation dynamics and nonadiabatic coupling between excited electronic states of methanol probed by time-resolved photoelectron spectroscopy”, J. Chem. Phys. 150, 114301 (2019). [link]
L. Inhester, L. Greenman, A. Rudenko, D. Rolles, R. Santra, “Detecting coherent core-hole wave-packet dynamics in N2 by time- and angle-resolved inner-shell photoelectron spectroscopy”, J. Chem. Phys. 151, 054107 (2019). [link]
R. E. Goetz, C. P. Koch, L. Greenman, “Perfect control of photoelectron anisotropy for randomly oriented ensembles of molecules by XUV REMPI and polarization shaping”, J. Chem. Phys. 151, 074106 (2019). [link]
*Chosen as a featured article*