Breathing Mode Excitation in Near Harmonic Systems: Resonant Mass Capture, Desorption and Atoms in Optical Lattices
John William Gadzuk
The phenomenon of breathing mode excitation or bound state wave packet squeezing and spreading driven by a time-dependent oscillator frequency [due to either a transient force constant or mass] is considered here. An easily implemented theory of stimulated wavepacket dynamics for near-harmonic systems is presented which described a variety of generic time dependences such as single sudden excitation, double switching [excitation/time-delay/de-excitation], and decaying initially excited states which characterize many processes in spectroscopy, pump-probe control in intramolecular dynamics, and femtochemistry. The model is used as the theoretical basis for understanding such diverse phenomena as quantum excitation due to temporary neutron capture, stimulated bond-breaking resulting in delocalization, desorption, or dissociation, and breathing mode excitation of ultracold atoms trapped in optical lattices. Whilst the first two examples are speculative, results for transient wave packet dynamics of the occupied excited optical lattice are in accord with recent experimental observations reported by the NIST Laser Cooling Group. Emphasis on the inherent theoretical simplicity and the multidisciplinary aspects of near-harmonic breathing mode excitation, as exemplified by the specific realizations considered here, has been a major intent of this topical review.
Journal of Physics B-Atomic Molecular and Optical Physics
Breathing Mode Excitation in Near Harmonic Systems: Resonant Mass Capture, Desorption and Atoms in Optical Lattices, Journal of Physics B-Atomic Molecular and Optical Physics
(Accessed March 4, 2024)