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Homework Help: What ion is this? even emission lines matches lyman series of hydrogen

  1. Jun 9, 2013 #1
    1. The problem statement, all variables and given/known data

    Calculate the wavelength of the Lyman-α line (the transition from the 1st excited
    state to the ground state) for (a) hydrogen atoms and (b) positronium e+e-, and explain
    the origin of their difference.

    In the light emitted from a star, a pattern of emission lines is found with every
    second line coinciding with a line of the Lyman series of hydrogen. Identify which ion
    causes this pattern and identify the observed transitions [assume the star is stationary
    with respect to the Earth].

    2. Relevant equations

    3. The attempt at a solution
    (a) the positronium is simply a particle of reduced mass μ = m1m2/(m1+m2) orbiting a central particle of m1+m2. μ = m/2.


    Is the ion a positronium? Since the E1 is proportional to m, and that positronium has half the mass of hydrogen..
    Last edited: Jun 9, 2013
  2. jcsd
  3. Jun 10, 2013 #2
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