Absolute, State-selective Measurements of the Photoionization Cross Sections of N+ and O+ Ions

Details Absolute, State-selective Measurements of the Photoionization Cross Sections of N+ and O+ Ions Absolute, State-selective Measurements of the Photoionization Cross Sections of N+ and O+ Ions

Jan 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002apjs..138..219k&link_type=abstract

The Astrophysical Journal Supplement Series, Volume 138, Issue 1, pp. 219-227.

Astronomy and Astrophysics

Astronomy

24

Atomic Data, Atomic Processes

Scientific paper

The absolute single-photoionization cross sections of singly charged nitrogen and oxygen ions have been measured from 29-80 eV and 30-150 eV, respectively, by merging a synchrotron-radiation beam from an undulator with a 2 keV ion beam. In the case of O+, separate data sets were obtained for the 4S ground state and the 2D/2P metastable states by attenuating the target-ion beam with N2 gas, exploiting the fact that cross sections for charge exchange between O+ ions, in the 4S or in the 2D/2P states, and N2 are different. The spectral structures were very different for the ground and the metastable states, whereas the cross sections for photoionization into the continua were nearly identical. The agreement between the experimental data and data calculated using the model function by Verner et al. or obtained from R-matrix calculations performed within the Opacity and the Iron projects is rather good. Finally, double photoionization (direct) was observed for O+ ions, with an approximately linear onset at 90 eV and a maximum cross section of 0.04 Mb. The experimental data are available at http://www.ifa.au.dk/amo/atomphys/atomphys.htm.

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