Abstract
average value of the photoionization cross section measured at the ionization threshold has been used to extract the f values for the 3s 2 S →np 2 P Rydberg series of lithium from n=14 ton=56. The measured f values of the observed Rydberg series decrease smoothly with an increase of the principal quantum number. The oscillator strength densities in the continuum region have also been determined from the measured values of the photoionization cross section from the 3s 2 S excited state at four ionizing laser wavelengths above the first ionization threshold. Continuity has been found between the discrete and the continuous spectrum across the ionization threshold.
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