Probing the valence character of O 1s-->Rydberg excited O2 by participator Auger decay measurements and partial ion yield spectroscopy following x-ray absorption |
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Authors: | Feifel R Tanaka T Kitajima M Tanaka H De Fanis A Sankari R Karlsson L Sorensen S Piancastelli M-N Prümper G Hergenhahn U Ueda K |
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Institution: | Department of Physics, Uppsala University, Box 530, SE-751 21 Uppsala, Sweden. |
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Abstract: | The valence character of O 1s-->Rydberg excited O2 is investigated by means of participator Auger decay spectroscopy, performed at selected photon energies across the K-shell resonance region, and by means of partial ion yield x-ray absorption spectroscopy. For several of the excitation energies studied, the authors find substantial sigma*(4Sigmau-, 2Sigmau-) valence character being mixed with nssigma and npsigma (4Sigmau-, 2Sigmau-) Rydberg states. An experimental indication of a coupling between the channels associated with quartet and doublet ion cores is considered and discussed. New spectroscopic constants are derived for the singly ionized X 2Pig state of O2 based on the observation of at least 20 vibrational sublevels. |
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