Abstract
Hydrogen atoms are detected in situ in atmospheric pressure CH/sub 4/ pyrolysis by three-photon ionization via two-photon resonance of the 2S arrow to the left 1S transition at 243 nm. An expected deuterium isotope shift of 22.4 cm/sup -1/ is observed during CD/sub 4/ pyrolysis. Similar resonant multiphoton ionization signals of H atoms and D atoms are also observed from thermal dissociation of H/sub 2/ and D/sub 2/, respectively. The ionization signals are converted into absolute concentration via the H/sub 2/ in equilibrium 2H equilibrium. The detection sensitivity is estimated to be approx. 10/sup -9/-10/sup -8/ mole fraction at 1-atm pressure.
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