Br2 ion pair state formation by electron beam excitation

D. C. Shannon, K. P. Killeen, J. G. Eden

Research output: Contribution to journalArticlepeer-review


The emission spectrum Of Br2 in the ultraviolet ( 180≤λ≤nm) has been examined in electron beam pumped rare gas-hydrogen bromide (HBr) gas mixtures. Temporally resolved and rare gas pressure-dependent studies of the Br2 fluorescence at 292 (D′→A′), 312,334, and 358 nm indicate that the formation processes for Br2 ion pair states differ for Ne and Ar diluents. Experimental evidence suggests that Br2 excited states in the first tier [correlated with Br- (1S0) + Br + (3P2) ] in Ar/HBr mixtures are formed by ion-ion recombination in which Br+ (3P2) is produced by charge transfer between Ar+ (2P) and HBr, followed by predissociation of HBr+ (A 2Σ +). In Ne buffer, Br2 states well above D′ are apparently produced by Penning ionization of HBr by Ne 3s 3P followed by recombination of Br+ (3P0,1,2) ions with Br- (1S0). Also, Ar is effective in collisionally relaxing the lowest manifold of six Br2 ion pair states but both Ne and Ar are poor quenchers of the D′ (2g) level.

Original languageEnglish (US)
Pages (from-to)1719-1731
Number of pages13
JournalThe Journal of Chemical Physics
Issue number3
StatePublished - 1988

ASJC Scopus subject areas

  • Physics and Astronomy(all)
  • Physical and Theoretical Chemistry


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