Giant Spin-Orbit Interactions in Ar Satellite Production
Abstract
The formation of quartet states of residual excited ions in photoionization is a clear indication of the presence of spin-orbit interactions. However, since they are dipole-forbidden in the non-relativistic limit, the cross sections for their formation are generally thought to be smaller than the cross sections for the production of dipole-allowed doublet states. We have found theoretically unexplained exceptions to this generally accepted argument in the measurements of the relative cross sections for ^2P_3/2^o , ^2P_1/2^o , ^2D_3/2^o , ^2D_5/2^o , ^4D_1/2^o , and ^4D_3/2^o satellite states of Ar^+. Specifically, we have measured at high photon and electron resolution electron spectra at the magic angle using the Gammadata SES-200 spherical electrostatic analyzer of beamline 10.0.1.2 of the ALS. We have found the cross sections for the quartet states to be 16 to 30 times larger than that of the doublet states. This counterintuitive result has not been theoretically addressed.
- Publication:
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APS Division of Atomic, Molecular and Optical Physics Meeting Abstracts
- Pub Date:
- May 2004
- Bibcode:
- 2004APS..DMP.D1085J