Prof. Shih-I Chu

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Many-Body Resonances in Atomic and Molecular Systems

"Resonances" are metastable, quasi-bound quantum states ("bound states in the continuum") that exist in various atomic, molecular, and cluster systems and play an essential role in chemical and physical dynamics. These resonances possess complex energies, whose imaginary parts are related to the lifetimes of the metastable species. Professor Chu's group has developed numerous complex-scaling (complex-coordinate rotation) coupled-channel techniques for accurate and efficient determination of the structure and complex energies (energies and lifetimes) of a number of atomic and molecular resonance systems, including van der Waals molecules, autoionizing and predissociating states, and laser field-induced complex quasi-energy resonances, etc.

Representative Publications and Review Articles:

S. I. Chu, Complex-coordinate coupled-channel methods for predissociating resonances in van der Waals molecules in Resonances in Electron-Molecule Scattering Van Der Waals Complexes and Reactive Chemical Dynamics, edited by D. G. Truhlar (American Chemical Society, Washington, D.C., 1984), no. 263 in ACS Symposium Series, pp. 263–288 [BibTeX]
S. I. Chu, The complex scaling method: Application to autoionization, predissociation, and multiphoton resonances, Int. J. Quantum Chem. / Quantum Chem. Symp. 20, 129–146 (1986) [BibTeX] [pdf]
S. I. Chu, Complex quasivibrational energy formalism for intense-field multiphoton and above-threshold dissociation: Complex-scaling Fourier-grid Hamiltonian method, J. Chem. Phys. 94, 7901–7909 (1991) [BibTeX] [link] [pdf]
S. I. Chu, The complex-scaling coupled-channel methods for atomic and molecular resonances in intense external fields in Applied Many-Body Methods in Spectroscopy and Electronic Structure, edited by D. Mukherjee (Plenum Press, New York, 1992), pp. 193–212 [BibTeX]
G. H. Yao and S. I. Chu, Laser-induced molecular stabilization and trapping and chemical bond hardening in intense laser fields, Chem. Phys. Lett. 197, 413–418 (1992) [BibTeX] [link] [pdf]
D. A. Telnov and S. I. Chu, Multiphoton detachment of H^- near the one-photon threshold: Exterior complex-scaling-generalized pseudospectral method for complex quasienergy resonances, Phys. Rev. A 59, 2864–2874 (1999) [BibTeX] [link] [pdf]
X. Chu and S. I. Chu, Complex-scaling generalized pseudospectral method for quasienergy resonance states in two-center systems: Application to the Floquet study of charge resonance enhanced multiphoton ionization of molecular ions in intense low-frequency laser fields, Phys. Rev. A 63, 013414 (2001) [BibTeX] [link] [pdf]
D. A. Telnov and S. I. Chu, Multiphoton above-threshold detachment of Li^-: Exterior-complex-scaling-generalized-pseudospectral method for calculations of complex-quasienergy resonances in Floquet formulation of time-dependent density-functional theory, Phys. Rev. A 66, 043417 (2002) [BibTeX] [link] [pdf]
S. I. Chu and D. A. Telnov, Beyond the Floquet theorem: generalized Floquet formalisms and quasienergy methods for atomic and molecular multiphoton processes in intense laser, Phys. Rep. 390, 1-131 (2004) [Invited review article] [BibTeX] [link] [pdf]
D. A. Telnov and S. I. Chu, High-order above-threshold multiphoton detachment of H^-: time-dependent non-Hermitian Floquet approach, J. Phys. B: At. Mol. Opt. Phys. 37, 1489–1502 (2004) [BibTeX] [link] [pdf]
D. A. Telnov and S. I. Chu, Ab initio study of high-order harmonic generation of H₂⁺ in intense laser fields: Time-dependent non-Hermitian Floquet approach, Phys. Rev. A 71, 013408 (2005) [BibTeX] [link] [pdf]

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Dept. of Chemistry
The University of Kansas