Alterations in preparation of tubes and direction of microwave power into them made to the method of Tomkins and Fred(2) for the excitation of spectra are described. A cavity resonator type of excitor gives intense spectra of uranium and plutonium without the need of an auxiliary furnace when tubes containing the iodide are used;sections of plates showing isotope shifts in lines from 235U, 236U and 238U, and 239Pu and 240Pu respectively are shown.
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