Abstract

Measurement of spectrograms of electrodeless discharges in purified polonium has yielded over 450 red-shaded band heads in Po210 and more than 500 heads in mixtures of Po208–Po209. Approximately 350 of these have been classified in a system concluded to be the principal system of Po–Po with the following constants(Po210–Po210):

Te=25149.3Kωe=108.532Kωexe=-0.4417Kωe=155.715Kωexe=-0.3353Kωeye=-0.0003226K.

Observed and calculated isotope shifts are in close agreement. The dissociation energy of the lower state is calculated to be 1.895 v under the assumption that the dissociation products are normal polonium atoms.

© 1957 Optical Society of America

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