An experimental physicist who, with Robert Vivian Pound, measured gravitational redshift over a laboratory height difference in the Pound-Rebka experiment. The Mössbauer effect supplies an exceptionally narrow nuclear resonance, allowing a tiny change in gamma ray energy to be detected. Controlled motion of the source produces a compensating Doppler shift, turning a difficult absolute energy comparison into a measurement of the velocity needed to restore resonance.[ref]
Apparent Weight of Photons by Robert Vivian Pound and Glen Rebka. 1960 report: resonant absorption, vertical separation and compensating source motion
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Glen Rebka is likely a reference to a notable experiment in the field of physics, conducted by physicist Glen A. Rebka in 1960 at Harvard University. The experiment is known as the "Rebka–Thomson experiment." It was designed to test the predictions of Einstein's theory of general relativity, specifically concerning the gravitational redshift of light. In the experiment, Rebka and his collaborator, Richard C.