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Homework Help: Finding Potassium's ionisation potential using Sharp, Principal etc. Series

  1. Feb 22, 2012 #1
    1. The problem statement, all variables and given/known data

    Make a rough estimate of the ionisation potential of potassium (19) given the following infomation relating to its optical spectrum:

    wavelength of the first line of the Sharp Series: 1248nm
    wavelength of the first line of the Principal Series: 767nm
    wavelength of the first line of the Diffuse Series: 1173nm
    wavelength of the first line of the Fundamental series: 1516nm

    speed of light = 2.998 x 10^8 m/s
    Planck Constant = 6.626 x 10^(-34)
    Rydberg constant R∞ = 1.097 x 10^7
    electronic charge = -1.602 x 10^(-19)

    2. Relevant equations

    I = (Rhc)/((n-δ)^2)

    3. The attempt at a solution

    I have no idea how to go about this at all. I have tried but got nothing..

    I was told that δ was a ratio of some sort.. but I don't know what of..

    A method of how to go about this would be great and an explanation of why would be handy too.
  2. jcsd
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