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Volume 142, 2009
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Molecular collisions, from warm to ultracold

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This introductory article contrasts molecular collisions, particularly reactive collisions, in the familiar “warm” domain with the ultracold regime where the relative deBroglie wavelengths become long compared with the range of interaction of the collision partners. Ultracold collisions have much greater sensitivity to entrance channel interactions, so offer the prospect of tuning by external fields to control onset of reaction. However, for ultracold collisions, kinematic constraints impose severe limitations on the observable dynamical properties. In the exit channel for appreciably exoergic reactions, the deBroglie wavelengths become short, so the exit dynamics are much like those for warm collisions. Reactions of alkali dimers, halides, and monoxide molecules are discussed that seem especially congenial for cold collision studies.

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The article was received on 21 May 2009, accepted on 27 May 2009 and first published on 22 Jul 2009

Article type: Paper
DOI: 10.1039/B910118G
Faraday Discuss., 2009,142, 9-23

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    Molecular collisions, from warm to ultracold

    D. Herschbach, Faraday Discuss., 2009, 142, 9
    DOI: 10.1039/B910118G

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