Excited-state absorption in HgBr

J. H. Schloss, J. G. Eden

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The photoabsorption spectrum of the lowest ion pair state (B 2Σ+1/2) of HgBr has been measured in the visible and ultraviolet (280≤λ≤480 nm) by laser excitation spectroscopy. Several previously unreported bands, peaking at 289, 302, 318, 330, 340, 364-373, and 401 nm, are observed and provide a stringent test for ab initio calculations of the excited state interaction potentials for the diatomic radical. A highly structured band lying between ∼444 and 470 nm confirms the observations of D. P. Greene, K. P. Killeen, and J. G. Eden [J. Chem. Phys. 85, 3188 (1986)] in a laser discharge. Also, the spectra fully resolve the apparent discrepancy between recent, unsuccessful attempts to produce a HgBr laser by flashlamp pumping the B←X band and experiments in which short pulse (8-25 ns) laser excitation of this transition has generated 502 nm coherent radiation with an energy conversion efficiency exceeding 20% [D. P. Greene, K. P. Killeen and J. G. Eden, Appl. Phys. Lett. 48, 1175 (1986)].

Original languageEnglish (US)
Pages (from-to)1282-1284
Number of pages3
JournalApplied Physics Letters
Issue number13
StatePublished - 1989

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)


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