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Jens Rud Nielsen (1894 - 20 April 1979) was born in Copenhagen and was a physicist at the University of Oklahoma. He was awarded the Guggenheim Fellowship in 1931.

Scientific Accomplishments
Nielson entered the University of Copenhagen in the fall semester of 1913, where world-renown physicist Niels Bohr was a professor. Nielson attended many of Bohr's lectures during his time at Copenhagen. Nielson resigned from the University of Copenhagen in 1922 and was employed at the University of Oklahoma in 1924. Eventually, in 1931, Nielson went back to Copenhagen and spent two years at Bohr's Institute.

At the University of Oklahoma he was told to create a research program for the University's physics program. Due lack of space and financial problems, Nielson was forced to use heat tunnels and old washrooms in the place of laboratories. During his time at the University of Oklahoma, Nielson supervised half of the physics PH.D. students. Eventually, Nielson's research program became the center of the creation of the University of Oklahoma National Research Institute.

In 1943, while he was still working for the University of Oklahoma, Nielson began building a large Raman infrared spectrometer for the Naval Research Laboratory. It was completed several years later, and for a time was known as the most powerful prism infrared spectrometer. Nielson stayed in contact with the Naval Research Laboratory for several years after this project. Together they investigated the vibrational spectra of fluorocarbons and fluorinated hydrocarbons.