Aston, Francis William (1877-1945), was an English physicist. In 1919 he invented the mass spectrograph, which made possible the separation of atoms according to extremely small differences in their masses. Using this instrument, Aston proved that almost all elements are composed of mixtures of various isotopes, sharing the same atomic number but differing in nuclear mass. Aston received the 1922 Nobel Prize in chemistry for this research. Aston was born in Birmingham, England.
Contributor: Bruce R. Wheaton, Ph.D., Director, Inventory of Sources for History of Twentieth-Century Physics.
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