The electronic energy levels for a Helium ion He+ (ie a nuclear charge of +2e and a single bound electron of –e) are similar to that of the hydrogen atom (ie a nuclear charge of +e and a single bound electron of charge –e), except for an extra factor of 4 corresponding to the square of the nuclear charge changing from (+e)2 for hydrogen to (+2e)2 for Helium. Thus, the electronic energy levels for Helium are 4 times the electronic energy levels for Hydrogen. If the He+ ions are initially excited to n=4, calculate the wavelengths for all the possible de-excitation transitions and use these wavelengths to sketch the emission line spectra for the He+ ions. The sketch should be to scale.
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