Nonstandard Behavior of a Negative Ion Reaction at Very Low Temperatures

R. Otto, J. Mikosch, S. Trippel, M. Weidemüller, and R. Wester
Phys. Rev. Lett. 101, 063201 – Published 5 August 2008

Abstract

We have studied the negative ion reaction NH2+H2NH3+H in the temperature range from 300 to 8 K. We observe a strongly suppressed probability for proton transfer at room temperature. With decreasing temperature, this probability increases, in accordance with a longer lifetime of an intermediate anion-neutral complex. At low temperatures, a maximum in the reaction rate coefficient is observed that suggests the presence of a very small barrier at long range or a quantum mechanical resonance feature.

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  • Received 7 March 2008

DOI:https://doi.org/10.1103/PhysRevLett.101.063201

©2008 American Physical Society

Authors & Affiliations

R. Otto, J. Mikosch, S. Trippel, M. Weidemüller, and R. Wester*

  • Physikalisches Institut, Universität Freiburg, Hermann-Herder-Straße 3, 79104 Freiburg, Germany

  • *roland.wester@physik.uni-freiburg.de

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Issue

Vol. 101, Iss. 6 — 8 August 2008

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