In 1960 Robert Pound carried out together with his assistant Glen Rebka an experiment, the Pound-Rebka experiment, using the Mössbauer effect to measure the gravitational redshift of the radiation from a gamma source in the gravitation field of planet Earth.
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In addition to his academic career he did much work as an experimental elementary-particle physicist at Los Alamos National Laboratory.
His fame grew immensely in 1960 when Robert Pound and Glen Rebka used this effect to prove the red shift of gamma radiation in the gravitational field of the Earth; this Pound–Rebka experiment was one of the first experimental precision tests of Albert Einstein's general theory of relativity.
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