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Düsseldorf 2007 – wissenschaftliches Programm

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MO: Fachverband Molekülphysik

MO 22: Cold Molecules I (gemeinsam mit Q)

MO 22.3: Vortrag

Dienstag, 20. März 2007, 11:15–11:30, 6B

A negative ion proton transfer reaction at extremely low temperatures — •Rico Otto, Jochen Mikosch, Sebastian Trippel, Christoph Eichhorn, Markus Debatin, Matthias Weidemüller, and Roland Wester — Physikalisches Institut, Universität Freiburg, Hermann-Herder-Str. 3, 79104 Freiburg

Using a low-temperature 22-pole ion trap we have studied the reaction of NH2 with molecular hydrogen in the temperature interval from 300 down to 8 Kelvin. We access in this experiment the, for negative ions previously unexplored, temperature regime below 25 Kelvin. For NH2 + H2 we observe an unexpected decrease of the reaction rate coefficient at low temperatures, which is indicative of a very small reaction barrier. In this presentation we will present the new low-temperature 22-pole trap setup, the employed experimental scheme to obtain absolute reaction rate coefficients, and the measurements for the proton transfer from H2 to NH2. We will then discuss the current status of the interpretation of the measured rate coefficient. In future experiments we will investigate in how far the temperature dependence of the studied proton-transfer reaction represents a general behaviour of negative ion reactions at low temperature.

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