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The avoided crossings in an electric field of K s and p states with the nearly hydrogenic Stark manifold states have been investigated using 300-K blackbody radiation. Anticrossings between states of the same ) mj~f or which the~mt~values are the same or differ by one are encountered. The anticrossings between states of the same~mI~are quite wide as they are due to core penetration and polarization effects. The anticrossings for which~mt~differs by one are produced by the spin-orbit interaction and are accordingly quite small. %e present results for the ns states for n in the range 18 -29 and for the np states for n in the range 19 -23.

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