Quantum-State Controlled Chemical Reactions of Ultracold Potassium-Rubidium Molecules
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- S. Ospelkaus
- JILA, NIST and University of Colorado, Department of Physics, University of Colorado, Boulder, CO 80309, USA.
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- K.-K. Ni
- JILA, NIST and University of Colorado, Department of Physics, University of Colorado, Boulder, CO 80309, USA.
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- D. Wang
- JILA, NIST and University of Colorado, Department of Physics, University of Colorado, Boulder, CO 80309, USA.
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- M. H. G. de Miranda
- JILA, NIST and University of Colorado, Department of Physics, University of Colorado, Boulder, CO 80309, USA.
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- B. Neyenhuis
- JILA, NIST and University of Colorado, Department of Physics, University of Colorado, Boulder, CO 80309, USA.
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- G. Quéméner
- JILA, NIST and University of Colorado, Department of Physics, University of Colorado, Boulder, CO 80309, USA.
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- P. S. Julienne
- Joint Quantum Institute, NIST and University of Maryland, Gaithersburg, MD 20899, USA.
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- J. L. Bohn
- JILA, NIST and University of Colorado, Department of Physics, University of Colorado, Boulder, CO 80309, USA.
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- D. S. Jin
- JILA, NIST and University of Colorado, Department of Physics, University of Colorado, Boulder, CO 80309, USA.
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- J. Ye
- JILA, NIST and University of Colorado, Department of Physics, University of Colorado, Boulder, CO 80309, USA.
書誌事項
- 公開日
- 2010-02-12
- DOI
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- 10.1126/science.1184121
- 公開者
- American Association for the Advancement of Science (AAAS)
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説明
<jats:title>Colliding in the Cold</jats:title><jats:p>Chemical reactions occur through molecular collisions, which, in turn, are governed by the distributions of energy in each colliding partner. What happens when molecules are cooled so that they no longer have sufficient energy to collide?<jats:bold>Ospelkaus<jats:italic>et al.</jats:italic></jats:bold>(p.<jats:related-article xmlns:xlink="http://www.w3.org/1999/xlink" ext-link-type="doi" page="853" related-article-type="in-this-issue" vol="327" xlink:href="10.1126/science.1184121">853</jats:related-article>; see the Perspective by<jats:bold>Hutson</jats:bold>) explored this question by preparing a laser-cooled sample of potassium rubidium (KRb) diatomics with barely any residual energy in any form (translational, rotational, vibrational, or electronic). By monitoring heat release over time, evidence was gathered for exothermic atom exchange reactivity through quantum mechanical tunneling. As predicted by theory, these reactions were exquisitely sensitive to the molecular states, with rates changing by orders of magnitude on varying minor factors such as nuclear spin orientation.</jats:p>
収録刊行物
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- Science
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Science 327 (5967), 853-857, 2010-02-12
American Association for the Advancement of Science (AAAS)