Abstract

A highly intense pulsed supersonic CH(X 2Π) radical beam source was developed by use of the C( 1D) + H 2 reaction. CH radicals were state-selected by an electrostatic hexapole field. The focusing curves for the single state-selected CH were measured for the first time by a saturated laser-induced fluorescence (LIF) spectroscopy for the R-branch in A 2Δ 3/2 ← X 2Π 1/2 transition. The maximum CH flux intensity in the lowest ∣ J, F, M〉 state, ∣1/2, 2, 1/2〉 was measured by LIF to be 3.2 × 10 12 rad cm −2 s −1 at the focusing point of 150 cm downstream from the nozzle.

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