An Thu-Le
Research Assistant Professor
Address:	229 Cardwell Hall
Phone:	(785) 532-1635
E-mail:	atle@phys.ksu.edu
Personal Webpage
Ph.D. Belarussian State University, 1994
B.S. Belarussian State University, 1990

Research Area

Theoretical Atomic Physics

Our main interests are focused in intense laser-matter interaction, in particular, strong-field ionization, High-order Harmonic Generation (HHG) from atoms and molecules. At present, full ab initio calculations for the processes involving molecule are not readily available, except for very simple molecules like H2+. Our aim is to develop theoretical models and approximate computational methods for these problems. We also look for the possibilities of extracting the structure information of molecules, by analyzing the HHG and rescattering electrons (RE) from the molecules, which are exposed in intense, femtosecond and/or attosecond laser pulses.

We’re also interested in ion-atom and general three-body collisions. Whereas high-energy ion-atom collisions can be treated semi-classically, the low-energy case is more difficult as fully quantum-mechanical treatment is needed. We have recently developed a fully quantum-mechanical approach - the Hyper-Spherical Close-Coupling (HSCC) method. A combination of HSCC and new diabatization & truncation techniques has been used to greatly simplify problem and reduce the amount of calculations. This approach has also been used in studying the physics near the double ionization threshold of He and helium-like ions, in an attempt to identify the quantum signature of chaos just below the threshold and test the Wannier law above the threshold.

More can be found in Prof. C.D. Lin’s webpage http://www.phys.ksu.edu/personal/cdlin/

Recent Selected Publications

• A. T. Le, X.-M. Tong, and C. D. Lin, Evidence of two-center interference in high-order harmonic generation from CO2, Phys. Rev. A 73, 041402(R) (2006).
• A. T. Le, T. Morishita, X.-M. Tong, and C. D. Lin, Signature of chaos in high-lying doubly-excited states of helium atom, Phys. Rev. A 72, 032511 (2005).
• A. T. Le, M. W. J. Bromley, and C. D. Lin, Positronium formation in positron-Li and positron-Na collisions at low energies, Phys. Rev. A 71, 032713 (2005).
• A. T. Le and C. D. Lin, Muon transfer from muonic hydrogen to atomic oxygen and nitrogen, Phys. Rev. A 71, 022507 (2005).
• A. T. Le, C. D. Lin, L. F. Errea, L. Mendez, A. Riera, and B. Pons, Comparison of Hyperspherical vs Common Reaction Coordinates Close-Coupling Methods for ion-atom collisions at low energies, Phys. Rev. A 69, 062703 (2004).
• A. T. Le, M. Hesse, T. G. Lee, and C. D. Lin, Hyperspherical close coupling calculations for charge transfer cross sections in Si4++H(D) and Be4++H collisions at low energies, J. Phys. B 36, 3281 (2003).
• C. N. Liu, A. T. Le, T. Morishita, B. D. Esry, and C. D. Lin, Hyperspherical close coupling calculations for charge transfer cross sections in He2++H(1s) collisions at low energies, Phys. Rev. A 67, 052705 (2003).