Reactive scattering of alkali dimers: Apparatus and experimental conditions

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Abstract
The design and construction of a molecular beam machine to study reactive scattering of a magnetically purified alkali dimer beam is described. Magnetic deflection measurements of a potassium nozzle beam indicate that ∼25 mole per cent K2 dimer is formed in the Laval expansion and that magnetic deflection reduces K atom impurity 2 beam. Velocity analysis measurements show a K2 Laval distribution Mach number M ∼ 11·5 and indicate vibrational excitation ∼4±4 kcal mole-1 for the K2 dimers.