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Perimeter Institute

Waterloo Science



Wing-Ki Liu

Present Research Activities

Laser-molecule interactions
We study theoretically the photodissociation of diatomic molecules using both classical and quantum mechanics. We have provided a clear physical picture, called bucket dynamics, to explain the efficiency of photoexcitation by chirped infrared laser pulses, and we are investigating the coherent control of molecular excitation by chirped lasers. We also study the classical dynamics of strong field ionization and dissociation of simple molecules without making the Born-Oppenheimer approximation so that both the electronic and nuclear motions are treated on equal footing. We are considering the classical calculation of high harmonic generation spectra, and the classical-quantum correspondence.

Molecular collision
Nonlinear optical studies of gaseous systems such as coherent Raman spectroscopy, collision-induced fluorescence, two-photon double resonance, and pump-probe experiments can yield valuable information about the underlying collision dynamics, which can be described by various generalized cross sections (GCS). These GCS's are determined by the intermolecular forces between atoms and molecules of the systems under study. We have an ongoing program of performing quantum mechanical, semiclassical, and classical calculations of the GCS's and comparing with experiments to extract information about the intermolecular potentials.

Particle-surface interactions
Recently we have studied the energy loss of atomic ions or clusters moving near solid surfaces and inside the solid using the response function formalism for the solid substrate. We are extending our studies to investigate the dissociation of molecular ions and the dynamics of Coulomb explosions. We are also studying the infrared and sum frequency generation spectra of atoms and molecules dsorbed on surfaces, and we are planning to use molecular dynamics techniques to study adsorbate-surface interactions.

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