Hannover 2010 – wissenschaftliches Programm

Bereiche | Tage | Auswahl | Suche | Downloads | Hilfe

MO: Fachverband Molekülphysik

MO 2: Collisions, Energy Transfer

MO 2.2: Vortrag

Montag, 8. März 2010, 14:15–14:30, F 142

Strong field effects in an ion molecule reaction — •Sebastian Trippel¹, Martin Stei¹, Rico Otto¹, Thorsten Best¹, Matthias Weidemüller², and Roland Wester¹ — ¹Physikalisches Institut, Universität Freiburg, Hermann-Herder-Str. 3, 79104 Freiburg — ²Physikalisches Institut, Universität Heidelberg, Albert-Überle-Str. 3-5, 69120 Heidelberg

Steric effects are known to play a role in chemical reactions involving non spherical reaction partners. In case of neutral-neutral reactions these effect were investigated by orienting molecules in static electric fields. For ion-molecule reactions the situation is slightly more awkward, since the electric field not only orients the molecules but also changes the trajectory of the ion. In contrast strong light fields, provided by pulsed lasers, could reveal a doorway to overcome this problem due to their capability to align molecules in free space [1]. We accomplish alignment due to the interaction of the fast oscillating electric field of the laser pulse with the induced dipole moment of the molecule. Nano second laser pulses allow to adiabatically transform the molecules into the space fixed state. This talk will present the status of our analysis on the reaction of Cl⁻ with CH₃I in strong laser fields up to 2· 10¹¹W/cm².
H. Stapelfeldt and T. Seideman, Rev. Mod. Phys. 75, 543 (2003)