Jesse William DuMond (11.07.1892-4.12.1976) was an American experimental physicist and a member of the National Academy of Sciences (1953). He was born in Paris. He graduated from the California Institute of Technology (1916), where he worked in 1921-63 (professor from 1946).
His research concerned spectrometry, acoustics, solid-state physics, the design of precision instruments for X-ray examination, atomic and nuclear physics, and the refinement of the fundamental physical constants. He studied the Compton scattering of X-rays and gave experimental proof of the quantum-mechanical distribution of electron momentum in the atom. He refined the value of Avogadro's number and of the ratio e/m. He measured (1949) the wavelength of the radiation from the annihilation of an electron and a positron. In 1963 he gave a table of consistent physical constants.