Dissociative charge transfer from highly excited Na Rydberg atoms to vibrationally excited Na2 molecules

Oliver Kaufmann, Aigars Ekers*, Christian Gebauer-Rochholz, Kai Uwe Mettendorf, Matthias Keil, Klaas Bergmann

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

7 Scopus citations


We report the observation of the vibrational dependence of dissociative charge transfer (DCT), Na2(X1Σg+, v″) + Na**(nl) → Na- + Na + Na+, in a single Na/Na2 supersonic beam at low intrabeam collision energies (1.6 meV) using the STIRAP technique for selective vibrational excitation of Na2 in the electronic ground state and time-of-flight mass analysis of the ions. The efficiency of this process increases by about an order of magnitude in the range 13 ≤ v″ ≤ 22. Some perspectives are discussed regarding the implementation of a field-free ion-imaging technique for the detection of ions that will allow the direct determination of the kinetic energy distributions of product negative ions and thus distinguish among different possible mechanisms of the DCT process. The first results of test experiments on imaging of photodissociation products of Na2(v″) without an extraction field are presented, confirming the potential of the new detection concept.

Original languageEnglish (US)
Pages (from-to)233-242
Number of pages10
JournalInternational Journal of Mass Spectrometry
Issue number1-3
StatePublished - Feb 15 2001
Externally publishedYes

Bibliographical note

Funding Information:
This work is supported by the Deutsche Forschungsgemeinschaft. One of the authors (A.E.) is supported by the EU Marie Curie Individual Fellowship MCFI-1999-00368. We thank H. Hotop and W. Meyer for valuable discussions and L. Meyer for laser assistance.


  • Dissociative charge transfer
  • Rydberg atoms

ASJC Scopus subject areas

  • Instrumentation
  • Condensed Matter Physics
  • Spectroscopy
  • Physical and Theoretical Chemistry


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