sentences:  Dennison's thesis was on the molecular structure and infrared spectrum of the methane molecule, and he was awarded his doctorate in 1924.From 1924 to 1926, Dennison had an International Education Board (IEB) Fellowship to do postgraduate study and research in Europe.By the end of that time, Harrison McAllister Randall, chairman of physics department at the University of Michigan, had arranged for Dennison to stay in Europe another year on a University of Michigan fellowship.