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Journal Article

Giant spin-orbit interactions in argon photoionization.


Canton,  S. E.
Research Group of Structural Dynamics of (Bio)Chemical Systems, MPI for Biophysical Chemistry, Max Planck Society;

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Jaecks, D. H., Yenen, O., McLaughlin, K. W., Canton, S. E., Bozek, J. D., & Downsbrough, M. (2004). Giant spin-orbit interactions in argon photoionization. Physical Review A, 70(4): 040703(R). doi:10.1103/PhysRevA.70.040703.

Cite as: https://hdl.handle.net/11858/00-001M-0000-002D-87D3-A
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]4p4Do1∕2 and 3p4[3P]4p4Do3∕2 quartet states over certain energy regions are 16 to 30 times larger than doublet states. This counterintuitive result remains to be theoretically explained.