Düsseldorf 2007 – wissenschaftliches Programm

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SYMC: Symposium Molecular Collisions at ultracold temperatures

SYMC 2: Molecular collisions at ultracold temperatures II

SYMC 2.1: Hauptvortrag

Montag, 19. März 2007, 16:30–17:00, 5D

Cold Molecular Ions: Single Molecule Studies — •Michael Drewsen — Department of Physics and Astronomy, University of Aarhus, Ny Munkegade, Build. 1520, DK-8000, Aarhus C, Denmark

In ion traps, the translational motion of molecular ions can effectively be sympathetically cooled to temperature in the mK range through the Coulomb interaction with laser cooled atomic ions. At such low temperatures the molecular ions typically become part of spatial ordered structures (Coulomb crystals) in which the individual molecules can be localized within a few µm³. The extreme situation of having only a single laser-cooled atomic ion interacting with a single molecular ion is an ideal starting point for single molecule studies. A few years back, we have demonstrated a rather simple non-destructive technique for the identification of the single molecular ion in such a situations relying on an in-situ mass measurement of the molecule. In the talk, I will focus on two recent single molecule studies using this technique, namely, photofragmentation of singly changed Aniline ions (C₆H₇N⁺) and isotope effects in the reaction of ²⁶Mg⁺ atomic ions with a H₂, HD, and D₂ molecules.