Abstract

Two ultraviolet photons (250–282 nm) excited atomic bromine, Br(4p52PJ;J=1/2,3/2), to the terms built from the 4p45p electronic configuration. Through visible and infrared (VIS–IR) transitions and/or collisions with ambient gases, the terms transfer to the 2,4DJ and 2,4PJ states in the 4p44d and 4p45s electronic configurations. The vacuum ultraviolet (VUV) emission (125–163 nm) from the 4p44d and 4p45s states to the 4p52PJ state was detected. Twenty in 25 allowed two-photon transitions were observed; however, no VUV or VIS–IR emission from the other five transitions was detected. The findings differ from those by the previous reports on the two-photon resonance-enhanced ionization.

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