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Homework Help: Ionic spectra for helium

  1. Feb 11, 2010 #1
    1. The emission line of He II at 468.6 nm corresponds to what electronic transition?

    2. I know that the formula 1 / λ = R(1 / nb2 - 1/ na2) may be useful but I'm not sure how the Rydberg's constant would change since it's helium. Also, I'm not sure what to assume as the initial energy state.

    3. I first tried to use the same value for R as it is for hydrogen, but it did not seem to give a reasonable answer. Any help would be greatly appreciated. Thanks!
  2. jcsd
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