Linked Life Data

20150499

Source:http://linkedlifedata.com/resource/pubmed/id/20150499

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
5967
pubmed:dateCreated
2010-2-12
pubmed:abstractText
How does a chemical reaction proceed at ultralow temperatures? Can simple quantum mechanical rules such as quantum statistics, single partial-wave scattering, and quantum threshold laws provide a clear understanding of the molecular reactivity under a vanishing collision energy? Starting with an optically trapped near-quantum-degenerate gas of polar 40K87Rb molecules prepared in their absolute ground state, we report experimental evidence for exothermic atom-exchange chemical reactions. When these fermionic molecules were prepared in a single quantum state at a temperature of a few hundred nanokelvin, we observed p-wave-dominated quantum threshold collisions arising from tunneling through an angular momentum barrier followed by a short-range chemical reaction with a probability near unity. When these molecules were prepared in two different internal states or when molecules and atoms were brought together, the reaction rates were enhanced by a factor of 10 to 100 as a result of s-wave scattering, which does not have a centrifugal barrier. The measured rates agree with predicted universal loss rates related to the two-body van der Waals length.
pubmed:commentsCorrections
pubmed:language
eng
pubmed:journal
pubmed:status
PubMed-not-MEDLINE
pubmed:month
Feb
pubmed:issn
1095-9203
pubmed:author
pubmed:issnType
Electronic
pubmed:day
12
pubmed:volume
327
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
853-7
pubmed:year
2010
pubmed:articleTitle
Quantum-state controlled chemical reactions of ultracold potassium-rubidium molecules.
pubmed:affiliation
JILA, NIST and University of Colorado, Department of Physics, University of Colorado, Boulder, CO 80309, USA.
pubmed:publicationType
Journal Article, Research Support, U.S. Gov't, Non-P.H.S.