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MO: Fachverband Molekülphysik
MO 12: Femtosecond Spectroscopy I
MO 12.2: Talk
Monday, March 19, 2007, 14:15–14:30, 6D
Theoretical analysis of high-order harmonic generation in complex molecules — •Marcelo Ciappina1, Agnieszka Jaron-Becker2, and Andreas Becker1 — 1Max-Planck-Institut für Physik komplexer Systeme, Nöthnitzer Str. 38, D-01187 Dresden, Germany — 2Institut für Physikalische Chemie und Electrochemie, Technische Universität Dresden, D-01062 Dresden, Germany
The interaction of complex molecules with strong lasers has opened a new scenario to study many-body electronic systems. Due to the multicenter nature of the molecular species, new phenomena appear as a consequence of the nonperturbative character of the interrelation between coherent electromagnetic radiation and such collection of atoms (e.g. [1]). In order to study the dependence of high-order harmonics on the molecular structure and orientation, molecules have to be prealigned prior to the actual strong-field interaction. Such alignment was performed in recent experiments where a combination of an aligning picosecond pulse and an intense femtosecond pulse was used [2]. In this work we present results for High-order Harmonic Generation (HHG) on complex molecules using the Strong Field Approximation (SFA) or Lewenstein model [3]. Using different types of molecules, we emphasize features relating to the interference patterns that appear as a consequence of the their multicenter nature. We show the differences among randomly and oriented molecules using a standard average procedure. [1] A. Jaroń-Becker et al, Phys. Rev. Lett. 96 143006 (2006). [2] J. Itatani et al, Phys. Rev. Lett. 94 123902 (2005). [3] M. Lewenstein et al, Phys. Rev. A 49 2117 (1994).