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Title: Ultra low-energy behavior of an ionic replacement reaction {sup 3}He{sup 4}He{sup +}+{sup 4}He{yields}{sup 4}He{sub 2}{sup +}+{sup 3}He

An accurate ab initio potential energy surface has been employed for the treatment of the full quantum dynamics for isotopic exchange reaction {sup 4}He{sup 3}He{sub 2}{sup +}+{sup 4}He. State-to-state reactive probabilities have been obtained using a time-independent approach at ultralow collision energies. More than one total angular momentum has been calculated in order to provide a converged rate constant for the title reaction within the ultralow temperature regime. The reaction is found to become faster than the Langevin value when T{yields}0, thus providing connection with experiments with sympathetically cooled molecular ions or superfluid helium nanodroplets.
Authors:
;  [1]
  1. Department of Chemistry, University of Rome La Sapienza, Piazzale A. Moro 5, 00185 Rome (Italy)
Publication Date:
OSTI Identifier:
20786908
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physical Review. A; Journal Volume: 73; Journal Issue: 3; Other Information: DOI: 10.1103/PhysRevA.73.032702; (c) 2006 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
74 ATOMIC AND MOLECULAR PHYSICS; ANGULAR MOMENTUM; ATOM COLLISIONS; HELIUM; HELIUM 3; HELIUM 4; ION COLLISIONS; ISOTOPIC EXCHANGE; MOLECULAR IONS; POTENTIAL ENERGY; PROBABILITY; SUPERFLUIDITY