Nanosecond light pulser with Hg vapor: Determination of quenching rate constants for Hg(3P1) with H2, C2H4, CO, and NH3

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High-Frequency And Rf Discharges

Scientific paper

A pulsed discharge lamp containing Hg vapor suitable for kinetic spectroscopy in the nanosecond time range is described. The spectral output is practically the same as that from a conventional low pressure mercury resoance lamp. The light intensity of the 253.7 nm resonance line is about 1010 photon/pulse. The width of light pulses is about 10 ns, except at 253.7 nm, which pulse width is about 40 ns. The repetition rate is 5-10 kHz. Quenching rates of Hg(3P1) atoms by H2, C2H4, CO, and NH3 are obtained by measuring decay rates of the 253.7 nm resonance line.

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