Abstract
A nuclear-spin and inversion state-selected NH 3 beam is produced by coupling molecular beam electric deflection techniques with the extreme rotational cooling of a pulsed supersonic expansion. Two-photon resonant three-photon ionization is used to probe the molecular beam quantum state distribution. The resulting beam is predominantly (> 95%) in a single quantum state (neglecting hyperfine structure), namely J k = 1 1, in the upper inversion state with para nuclear spin symmetry.
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