Photoionization and Absorption Cross Sections of I_2 in the 600-1000A Wavelength Region

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Absorption cross sections and photoionization efficiencies of J_2 have been measured in the 600 to 1000Å region by the double and single ion-chamber methods, using a He continuum light source, with a resolution of about 2Å. The absolute photon intensity was determined by calibrating the chamber with Ar and Xe gases. In this wavelength region, the absorption spectrum of I_2 consisted only of a smooth ionization continuum, and no band structure was found. The absorption cross section decreases monotonically with respect to photon energy from the value of 100 Mb at 1000Å to the value of 25 Mb at 600Å. There is, however, some undulation superposed on the downward sloping curve, with a kind of shoulder at about 740Å. This observation may be explained by the interference effect in the photoionization of molecules which was first suggested by Cohen and Fano. Ionization efficiencies of less than 1.0 were observed in the range of about 820Å and above, and at shorter wavelengths they were observed to be equal to or slightly larger than 1.0.
社団法人日本物理学会の論文
1969-10-05