Absolute photoionization cross section for C[sup +]

Folkmann, F.; Hansen, J. E.; Kjeldsen, H.; Knudsen, H.; Rasmussen, M. S.; West, J. B.; Andersen, T.
February 2000
AIP Conference Proceedings;2000, Vol. 500 Issue 1, p218
Academic Journal
The absolute photoionization cross section for the astrophysically important C[sup +] ion has been measured for the first time thus allowing a test of the predicted cross section from the Opacity Project. The measurements are performed with a new ion-photon merged beam setup at the ASTRID storage ring utilizing an undulator beam line. In addition to the predicted 2s2p([sup 3]P)np [sup 2]D and [sup 2]S autoionizing resonances, the [sup 2]P states which are not included in the theoretical predictions also contribute significantly to the ionization yield below the 2s2p([sup 3]P) limit. The cross section is determined with a precision of 10% and lies 5–25% below the theoretical prediction at 24–37 eV. © 2000 American Institute of Physics.


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