Values of photoabsorption cross-sections for some gases have been obtained as a function of wavelength from the ionization threshold to the soft X-ray region. The curves exhibit shoulders which are tentatively compared with some recent theoretical calculations.
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The photoionization cross sections of several gases were obtained by making simultaneous measurements of the total absorption cross sections and ionization efficiencies in the wavelength region from 473 A to 1100 A. In each case the total absorption cross sections were in agreement with those reported by others. For O2, the ionization cross sections were found to be between 5 and 30×10-18 cm2, while those for N2 were close to 23×10-18 cm2 over almost the entire range studied. The ionization cross section section of argon at the onset of ionization was compared with the theoretical estimate made by Dalgarno. The long-wavelength limits for photoionization were determined and were found to yield ionization potentials in good agreement with those obtained by spectroscopic and electron impact methods.
