Abstract
We have measured the final atomic excited-state alignment following the quantum-state-selected photodissociation of ${\mathrm{K}}_{2}$ through quasibound rotational resonance states using cw all-optical triple resonance spectroscopy. This process constitutes the half-collision analog of ${\mathrm{K}}^{\mathrm{*}}$+K scattering through a precisely quantum-state-selected orbiting resonance. The final atomic-state alignment depends sensitively on the parity of the excited continuum state. The experimental results show excellent agreement with theoretical calculations.
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