Francis Aston,British physicist

Numéro d’image : 11827182
Francis Aston,British physicist
Francis Aston (1877-1945),British physicist and Nobel laureate. Having discovered that neon had two isotopes,or possible molecular weights,Aston invented the mass spectrograph. This device allowed him to identify the isotopes present in a substance. His technique led him to discover 212 naturally-occurring isotopes,and won him the 1922 Nobel Prize in Chemistry. He also described the Whole Number Rule,or theory that all nuclei have weights that are whole-number multiples of 1/16th of the oxygen-16 isotope. This portrait is from the Bain News Service,one of America's oldest news picture agencies,which holds images dating from the 1890s to the 1930s
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