Source: wikibot/alfred-o-c-nier
= Alfred O. C. Nier
{wiki=Alfred_O._C._Nier}
Alfred O. C. Nier (1911–2000) was an American physicist known for his significant contributions to the fields of nuclear physics and mass spectrometry. He is particularly recognized for developing the first mass spectrometer that was able to accurately measure the isotopic composition of elements, which had profound implications for various scientific fields, including geology, chemistry, and biology.