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Volume 13: Pages 256-264, 2000
Resonances in Atomic and Molecular Multiphoton Processes
P. G. Burke
1Department of Applied Mathematics and Theoretical Physics, The Queen's University of Belfast, Belfast BT7 1NN, Northern Ireland
This essay discusses resonances that occur when multi‐electron atoms and molecules are exposed to intense laser fields. The subject owes much to the fundamental studies by Ugo Fano on the interference of autoionizing states with continua giving rise to asymmetric peaks in excitation spectra. The approach adopted is based on R‐matrix Floquet theory, a nonperturbative ab initia method, which has been used to describe in a unified way a wide range of multiphoton processes. The theory is illustrated by presenting results obtained for resonances in the multiphoton spectra of He, Ar, and H2. Finally, the essay concludes by considering possible future directions of research.
Keywords: argon, autoionizing state, Fano profile, helium, laser, LIDS, molecular hydrogen, multiphoton ionization, R‐matrix Floquet
Received: August 15, 2000; Published online: December 15, 2008