Origin of the 454 nm bound→free absorption band of cadmium monoiodide (114CdI)

D. P. Greene, J. G. Eden

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The bound→free absorption band recently observed in a 114CdI laser discharge [Greene and Eden, Opt. Comm. (1985)] is shown to arise from absorption by the B 2Σ excited state of 114CdI to a previously unobserved level lying ∼4.3×10 4 cm-1 above ground. Pumping of the absorptive transition with a pulsed blue dye laser strongly suppresses gain (and, hence, laser output power) on the B→X band in the red (657 nm). Therefore, this constitutes the first known report of an ionic excited state→covalent absorption band [i.e., (M+X-)+ℏω→M*+X; M, X=metal and halogen atoms, respectively] for any of the group IIB metal halides or rare gas-halide laser molecules. Also, ωe for the B 2Σ state of 114CdI is ≳ 110 cm-1 (considerably larger than an existing value in the literature) and the terminal level for this blue absorption band is tentatively assigned to a dissociative 2Σ state correlated with the Cd(5p 3PJ)+I separated atom limit.

Original languageEnglish (US)
Pages (from-to)702-708
Number of pages7
JournalThe Journal of Chemical Physics
Issue number2
StatePublished - 1985

ASJC Scopus subject areas

  • General Physics and Astronomy
  • Physical and Theoretical Chemistry


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