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- W2091921775 abstract "Abstract By monitoring the green fluorescence transition of mercury vapor 7 3 S 1 →6 3 P 0 2 (546.074 nm) excited by two pulsed dye lasers tuned at two connected atomic resonant frequencies, i.e. 6 1 S 0 →6 3 P 0 1 (253.652 nm) and 6 3 P 0 1 → 7 3 S 1 (435.835 nm), a decrease in the green fluorescence yield is experimentally observed when the intensity of the 435.835-nm excitation transition exceeds ∼5 kW/cm 2 . A similar result is obtained at the yellow fluorescence transition 6 3 D 1 →6 1 P 0 1 (578.967 nm) when the second step is tuned to the 6 3 P 0 1 →6 3 D 1 transition (313.159 nm). At the same time, an increase in the transmittance of the ground state transition (253.652 nm) is observed. It is speculated that this effect, which occurs only when both laser pulses are temporally coincident, and is therefore not due to photoionization, can be ascribed to the existence of laser induced effects, such as a.c. Stark splitting of levels and possibly electromagnetically-induced transparency (EIT). Our experiment does not allow us to distinguish between these two effects, nor their quantitative evaluation. However, it is stressed that one cannot overlook them in those atomic multi-step excitation experiments in low collisional environments where a depletion of an intermediate level is involved, as for example in the case of atomic fluorescence dip spectroscopy or atomic multistep and multiphoton resonance ionization spectroscopy." @default.
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- W2091921775 date "1999-12-01" @default.
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- W2091921775 title "Laser-induced population depletion effects in double resonance excitation with 202Hg vapors" @default.
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- W2091921775 doi "https://doi.org/10.1016/s0584-8547(99)00155-x" @default.
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