Collisional energy transfer in the intermediate states used for optical-optical double resonance excitation of ion-pair states in I-2

Trevor Ridley*, Kenneth P. Lawley, Robert J. Donovan

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

The optical-optical double resonance spectra of I-2 and I-2-Xe mixtures at room temperature reported in the literature using a fixed-wavelength, broad band pump laser have now been recorded using a tuneable, narrow band source. We show that during the time of the overlapped laser pulses (similar to 10 ns) and with 10-20 Torr of Xe there is widespread collisional energy transfer in the intermediate state and that this phenomenon offers an alternative explanation for the broad bands in the excitation spectrum, assigned to XeI2 complexes by the authors of the earlier study (M. E. Akopyan, I. Y. Novikova, S. A. Poretsky and A. M. Pravilov, Chem. Phys., 2005, 310, 287). Dispersed emission bands, previously attributed to direct fluorescence from the ion-pair state(s) of the complexes, are re-assigned to emission from ion-pair states of the parent I-2 that are populated by collisional energy transfer out of the initially excited state.

Original languageEnglish
Pages (from-to)255-261
Number of pages7
JournalPhysical Chemistry Chemical Physics
Volume9
Issue number2
DOIs
Publication statusPublished - 2007

Keywords

  • EXCITED IODINE MOLECULES
  • NONADIABATIC TRANSITIONS
  • I2
  • NE
  • COMPLEXES
  • CONSTANTS
  • DYNAMICS
  • CLUSTERS
  • SYSTEM
  • HE

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