In 1926, Emil Rupp published a number of papers on the interference properties of light emitted by canal ray sources. These articles, particularly one paper that came into being in close collaboration with Albert Einstein, drew quite some attention as they probed the wave versus particle nature of light. They also significantly propelled Rupp's career, even though from the outset they were highly controversial. This article reviews this episode, and in particular Rupp's collaboration with Einstein. Evidence that Rupp forged his results is presented and their critical reception in the socially and politically-divided German physics community is discussed. These divisions fail to explain the full dynamic; the latter is approached by turning to the role that theoretical bias has on occasion in assessing experiment. Einstein's responses are also analyzed in this context.
Emil Rupp, Albert Einstein, and the canal ray experiments on wave-particle duality: Scientific fraud and theoretical bias
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Jeroen Van Dongen; Emil Rupp, Albert Einstein, and the canal ray experiments on wave-particle duality: Scientific fraud and theoretical bias. Historical Studies in the Physical and Biological Sciences 1 March 2007; 37 (suppl): 73–120. doi: https://doi.org/10.1525/hsps.2007.37.s.73
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