What type of details about Émile henriot -lrb- chemist -rrb-  can be gathered from the following bio?  Bio: `` not to be confused with Émile henriot -lrb- 1889 - 1961 -rrb- , french writer '' Émile henriot -lrb- 2 july 1885 - 1 february 1961 -rrb- was a french chemist notable for being the first to show definitely that potassium and rubidium are naturally radioactive . he investigated methods to generate extremely high angular velocities , and found that suitably placed air-jets can be used to spin tops at very high speeds - this technique was later used to construct ultracentrifuges . he was a pioneer in the study of the electron microscope . he also studied birefringence and molecular vibrations . he obtained his dsc in physics in 1912 the sorbonne , paris , under marie curie .
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