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Abstract
Ground (3PJ) and excited state (1D2, 1S0) sulfur atoms have been produced by the two-photon photodissociation of H2S in the wavelength range 285–316 nm. The resultant sulfur atoms undergo 2+1 resonance enhanced multiphoton ionization (REMPI) at selected laser wavelengths. The initial and final ion states in the 2+1 REMPI process have been determined through the analyses of the REMPI spectrum (laser wavelength scan) and the REMPI-PES taken at the atomic resonances. The intermediate states accessed in the two-photon excitations have been assigned. Several transitions which originate from the 1S0 excited state of atomic sulfur have been observed. The intermediate states of these transitions lie above the ionization continuum and are depleted competitively by autoionization and further photon absorption. Extremely pure state selection of ground and excited sulfur atomic ions is demonstrated at several of the two-photon resonances. Evidence of configuration interaction between the 6p 3P1, 6p 5P1, and 4p 1P1 levels is presented.
Published Version
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