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In the 1930s, Kohn eventually fled to the United States, where she’d spend nearly two decades teaching physics at the Woman’s College of the University of North Carolina and Wellesley College in Massachusetts.
After retiring from teaching, Kohn continued her research on flame spectroscopy at Duke University, "measuring absorption features and concentrations of mostly atomic species in flames," the JWA reported. According to the archives, Kohn's research "experienced a renaissance in the 1960s in the framework of combustion science and plasma physics," and led to more than 20 publications, including multiple chapters in physics textbooks. While her textbook contributions aren't widely used anymore, Kohn is still considered a pioneer in the field of physics.
She died on March 26, 1964, in North Carolina. Kohn was 77 years old.