Josef Heinrich Elizabeth Mattauch

Mattauch of Austria, he developed a double-focusing type of mass spectrograph, a device used to measure the mass of atomic nuclei. Dempster devoted much of his career almost exclusively to a single task—that of using mass spectrometry techniques to discover stable isotopes of the chemical…

…in the United States, and Josef Mattauch, in Germany, independently developed instruments with electric and magnetic fields arranged in tandem in such a way that ion beams that emerged from the source slits in divergent directions and with different velocities were refocused. Such focusing is termed double focusing. It was…