Volume 142, 2009

Molecular collisions, from warm to ultracold

Abstract

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.

Article information

Article type
Paper
Submitted
21 May 2009
Accepted
27 May 2009
First published
22 Jul 2009

Faraday Discuss., 2009,142, 9-23

Molecular collisions, from warm to ultracold

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

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