Frankfurt 2006 – wissenschaftliches Programm
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MO: Molekülphysik
MO 52: Cold molecules I
MO 52.6: Vortrag
Donnerstag, 16. März 2006, 12:10–12:25, H10
Sympathetic cooling of singly-protonated polyatomic molecules to sub-Kelvin temperatures — •Alexander Wilson, Chaobo Zhang, David Offenberg, Alexander Ostendorf, Bernhard Roth, and Stephan Schiller — Heinrich-Heine-Universität Düsseldorf
Alexa Fluor 350, a fluorescent dye molecule of mass 410 AMU, has been transferred from an electro spray ionisation (ESI) source to a linear Paul trap. Around 2300 laser-cooled 138Ba+ ions in a Coulomb crystal were used to sympathetically cool approximately 600 Alexa Fluor ions to below 100 mK. Observations are well described by molecular dynamic simulations, which are used to determine the number of ions, their spatial distribution and translational temperature. The ESI technique should allow many different kinds of molecules to be transferred for trapping and sympathetic cooling: of particular interest may be molecules of very high mass and those of biological relevance, indeed, Alexa Fluor 350 is usually used in biological studies for protein labelling.