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Details

Autor(en) / Beteiligte
Titel
Collision-driven state-changing efficiency of different buffer gases in cold traps: He(1S), Ar(1S) and p-H2(1Σ) on trapped CN−(1Σ)
Ist Teil von
  • Physical chemistry chemical physics : PCCP, 2021-04, Vol.23 (13), p.7703-7713
Ort / Verlag
Cambridge: Royal Society of Chemistry
Erscheinungsjahr
2021
Quelle
Alma/SFX Local Collection
Beschreibungen/Notizen
  • We employ potential energy surfaces (PES) from ab initio quantum chemistry methods to describe the interaction of the CN−(1Σ) molecule, one of the small anions often studied at low temperatures, with other possible gases which can be employed as buffer in cold ion traps: the He and Ar atoms and the p-H2 molecule. These PESs are used to calculate from quantum multichannel dynamics the corresponding state-changing rate constants between the populated rotational states of the anion, the latter being in its electronic and vibrational ground states. The different cross sections for the collision-driven quenching and excitation processes at low temperatures are compared and further used to model CN− cooling (de-excitation) efficiency under different trap conditions. The interplay of potential coupling strength and mass-scaling effects is discussed to explain the differences of behaviour among the buffer gases. The advantages of being able to perform collisional cooling at higher trap temperatures when using Ar and p-H2 as buffer gases are also discussed.
Sprache
Englisch
Identifikatoren
ISSN: 1463-9076
eISSN: 1463-9084
DOI: 10.1039/d0cp03440a
Titel-ID: cdi_proquest_miscellaneous_2434755383

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