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We have examined the sensitivity of single and sequential two-photon laser-induced fluorescence (LIF) techniques for the detection of elemental mercury, Hg(0), in the gas phase. Single photon LIF involves excitation of the 6 3 P 1 -6 1 S 0 transition at 253.7nm, followed by observation of resonance fluorescence. Sequential two-photon techniques follow the initial 6...