Osnabrück 2002 – scientific programme
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A: Atomphysik
A 1: Multiphotonen I
A 1.4: Talk
Monday, March 4, 2002, 17:15–17:30, HS 15/E10
Intense Laser Field Ionization of Complex Molecules-The Importance of Intramolecular Multielectron Dynamics — •Matthias Lezius1, Misha Yu. Ivanov2, Albert Stolow2, and Valerie Blanchet3 — 1Universiät Innsbruck, Institut für Ionenphysik, Technikerstr. 25, A-6020 Innsbruck — 2Steacie Institut for Molecular Sciences, National Research Council Canada, 100 Sussex Dr., Ottawa ON K1A 0R6 Canada — 3Université Paul Sabatier, IRSAMC 118 Route Narbonne, 31400 Toulouse, France
We report the observation and characterization of a new, non-resonant intense field ionization mechanism in polyatomic molecules: non-adiabatic multi-electron (NME) dynamics. The response of a given molecule depends on parameters such as molecular geometry and bonding, the path length of delocalized electrons and/or ionization potential as well as on basic laser beam parameters such as wavelength and intensity. Popular quasi-static tunnelling models of strong field molecular ionization, based upon an adiabatic electron response, are demonstrated to be inadequate when electron delocalization becomes important. The NME ionization mechanism greatly affects molecular ionization, its fragmentation and its energetics. Such multi-electron effects are present even in the long wavelength limit. These results have important consequences for many applications of intense femtosecond pulses, from controlling molecular dynamics to mass spectrometry.