Arthur J. Dempster, Canadian physicist

Arthur J. Dempster, Canadian physicist

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Credit: EMILIO SEGRE VISUAL ARCHIVES/AMERICAN INSTITUTE OF PHYSICS/SCIENCE PHOTO LIBRARY

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Caption: Arthur Jeffrey Dempster (1886-1950), Canadian-American physicist. Dempster is best known for his work in mass spectrometry, the analysis of compounds by looking at the mass and charge ratios. He developed the first modern mass spectrometer, which was over 100 times more accurate than previous versions, and established the basic theory and design of mass spectrometers that continues to be applied today. Dempster's work on mass spectrometry led to his discovery of the radioactive uranium-235 isotope.

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