München 2004 – wissenschaftliches Programm

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MO: Molekülphysik

MO 12: Poster I

MO 12.11: Poster

Dienstag, 23. März 2004, 14:00–16:00, Schellingstr. 3

Indirect versus direct photoionization with ultrashort pulses: interferences and time–resolved bond-length changes — •Volker Engel and Stefanie Graefe — Institut für Physikalische Chemie, Universität Würzburg, Am Hubland, D-97074 Würzburg, Germany

The photoionization of NaI molecules with femtosecond laser pulses leads to photoelectron distributions which vary with the delay between a pump– and a probe–pulse. If the vibrational wave packet as prepared in the pump–transition is located in a region where the bonding character is ionic, the photoelectron, due to its localization on the iodine atom, may be ejected directly or be scattered from the Na⁺ ion. This leads to structures in the photoelectron spectrum which, in turn, reflect temporal bond-length changes.