A series of lines in the spectrum of neutral Li atoms rise from combinations of 1s 2

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A series of lines in the spectrum of neutral Li atoms rise from combinations of 1s22p1 2P with 1s2nd1 2D and occur at 610.36nm, 460.29nm, and 413.23nm. The d orbitals are hydrogenic. It is known that the 2P term lies at 670.78nm above the ground state, which is 1s22s1 2S. Calculate the ionization energy of the ground-state atom.

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