Determination of absolute recurrent fluorescence rate coefficients for C 6 -

Vijayanand Chandrasekaran, Bhim Kafle, Aneesh Prabhakaran, Oded Heber, Michael Rappaport, Hilel Rubinstein, Dirk Schwalm, Yoni Toker, Daniel Zajfman

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51 Scopus citations


We determined absolute rate coefficients for the recurrent fluorescence (RF) process in C6- anions at excitation energies above the adiabatic electron attachment energy of 4.18 eV. The experiment was performed by extracting C6- ions from a sputter ion source and storing them in a bent electrostatic ion beam trap. After 1 s of storage, during which the anions cooled down to temperatures close to room temperature, they were excited by a short laser pulse and the neutralization rate due to vibrational autodetachment (VAD) was measured as a function of time at several wavelengths. Due to the different energy dependence of the two competing decays via the RF and the VAD process, their contributions to the measured total decay rate coefficients could be disentangled. For excitation energies 4.6 eV, the decay is found to be dominated by the RF process with decay rate coefficients on the order of 5 × 104 s-1. The result clearly demonstrates the presence of the RF process in C6 and illustrates the importance of this process in the production and cooling of isolated molecules of astrophysical interest.

Original languageEnglish
Pages (from-to)4078-4082
Number of pages5
JournalJournal of Physical Chemistry Letters
Issue number23
StatePublished - 4 Dec 2014
Externally publishedYes

Bibliographical note

Publisher Copyright:
© 2014 American Chemical Society.


  • electrostatic ion beam trap
  • photodetachment
  • radiative stabilization
  • vibrational autodetachment


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