= Louis Dunoyer de Segonzac
{c}
{tag=Physicist}
{title2=1880–1963}
= Louis Dunoyer
{c}
{synonym}
= L. Dunoyer
{c}
{synonym}
An experimental <atomic physicist> who demonstrated a thermal <atomic beam> of <sodium> in 1911. Vapor escaped through narrow slits into an evacuated vessel and condensed on a wall cooled with liquid air. The deposit matched the geometry predicted for straight-line trajectories, giving a visible test of molecular motion between collisions and a foundation for later <molecular beam> experiments.<The Method of Molecular Rays by Otto Stern>[Opening description of Dunoyer’s sodium beam, slit geometry and cooled-wall deposit]{ref}
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