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.[ref]
The Method of Molecular Rays by Otto Stern. Opening description of Dunoyer’s sodium beam, slit geometry and cooled-wall deposit
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Louis Dunoyer de Segonzac was a French painter and graphic artist known for his contributions to the world of art in the early to mid-20th century. Born in 1884 and passing away in 1972, he was associated with various artistic movements, particularly focusing on landscape and figurative painting. Dunoyer de Segonzac was also recognized for his work in etching and printmaking.