A series of lines in the spectrum of neutral Li atoms rise from transitions between 1s22p1 2P and 1s2nd1 2D and occur at 610.36 nm, 460.29 nm, and 413.23 nm. The d orbitals are hydrogenic. It is known that the transition from the 2P to the 2S term (which arises from the ground-state configuration 1s22s1) occurs at 670.78 nm. Calculate the ionization energy of the ground-state atom.

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