Abstract
Oscillator-strength measurements have been calibrated against the radiative lifetime for the 4s-4p transition of potassium. This yields a value of (8.1 + or - 0.5) times 10 to the -21 sq cm for the photoionization cross section at the series limit, and implies a value for the cross-section minimum in good quantitative agreement with that calculated by Seaton (1951).
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