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Phys. Rev. A 70, 040703(R) (2004) [3 pages]

Giant spin-orbit interactions in argon photoionization

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D. H. Jaecks1, O. Yenen1, K. W. McLaughlin2, S. Canton3, J. D. Bozek4, and M. Downsbrough1
1Behlen Laboratory of Physics, University of Nebraska–Lincoln, Lincoln, Nebraska 68588-0111, USA
2Department of Physics and Engineering, Loras College, Dubuque, Iowa 52004-0178,USA
3Department of Physics, Western Michigan University, Kalamazoo, Michigan 49008, USA
4Advanced Light Source, Ernest Orlando Berkeley National Laboratory, University of California, Berkeley, California 94720, USA

Received 19 February 2004; published 29 October 2004

We have measured the relative cross sections for quartet and doublet satellite states of Ar+ formed in photoionization. Quartet states are dipole forbidden in the nonrelativistic limit and result from spin-orbit interactions in the continuum [ H. W. Van der Hart and C. H. Greene J. Phys. B 32 4029 (1999)]. Because of this, the cross sections for their formation are generally thought to be smaller than the dipole-allowed doublet states. We find that the cross sections for the 3p4[3P]4p 4D1∕2o and 3p4[3P]4p 4D3∕2o quartet states over certain energy regions are 16 to 30 times larger than doublet states. This counterintuitive result remains to be theoretically explained.

© 2004 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevA.70.040703
DOI:
10.1103/PhysRevA.70.040703
PACS:
32.80.Fb
 
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