Abstract

The absorption spectra of Kr and Xe have been photographed in the 70–200 Å region, revealing many weak, previously unobserved, resonances in the photoionization continua of these gases. The new structures occurring in the 110–115 Å region for Kr and 145–160 Å for Xe are due to two-electron excitation states involving an inner-shell d electron and an outer-shell p electron. The resulting configurations are characteristic of the neutral atom, although they lie, in energy, well above the third ionization limits for these atoms. Additional resonances in Xe, photographed in the 90-Å region, are due to the excitation of an inner-shell 4p electron. An improved value has been obtained for the NIII edge of Xe, namely, 145.6 (±0.5) eV. These spectra were obtained using the pure continuum radiated by the NBS 180-MeV electron synchrotron as a background source.

© 1965 Optical Society of America

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