TY - JOUR
T1 - High resolution study of the inner-shell 3p-3d and 3p-5s resonance regions in calcium atoms
AU - Iablonskyi, D.
AU - Urpelainen, S.
AU - Huttula, S. M.
AU - Fritzsche, S.
AU - Huttula, M.
N1 - Funding Information:
The work has been financially supported by the Research Council for Natural Sciences and Engineering of the Academy of Finland and the European Community's Seventh Framework Programme (FP7/2007-2013) under grant agreement no. 226716 . We thank S. Osmekhin and J.A. Kettunen for assistance in the experiments and S. Aksela for the original design of the evaporation oven. We also thank the MAX-lab staff for their contribution during the experiments.
PY - 2013/2
Y1 - 2013/2
N2 - The 3p54s23d 1P1 and 3p5( 2P3/2)4s25s 2[3/2]1 resonance regions of Ca atoms have been studied experimentally with the aid of synchrotron radiation excited electron spectroscopy. The strong configuration interaction of the 3p54s23d, 3p54s 25s and several other nearly degenerate configurations leads to complex structures observed in the photoelectron yield spectrum. Multiconfiguration Dirac-Fock (MCDF) calculations have been performed for these 3p-excited resonances of neutral calcium and compared to experimental results. The excitation and subsequent autoionization of these resonances lead to the final ionic 3p6nl states from which new high-lying members of the Rydbergp-series have been resolved experimentally. These new levels agree reasonably well with calculations as well as with the extrapolation of the Rydberg formula. The post collision interaction (PCI) effect has been observed in the transition Ca+ 3p53d4s 2P1/2,3/2 Ca 2+ 3p6 1S0 + eTer and explained by means of the rather long core-hole lifetime, while the decay of Ca+ 3p53d4s 4P1/2,3/2,5/2 states is not affected by PCI.
AB - The 3p54s23d 1P1 and 3p5( 2P3/2)4s25s 2[3/2]1 resonance regions of Ca atoms have been studied experimentally with the aid of synchrotron radiation excited electron spectroscopy. The strong configuration interaction of the 3p54s23d, 3p54s 25s and several other nearly degenerate configurations leads to complex structures observed in the photoelectron yield spectrum. Multiconfiguration Dirac-Fock (MCDF) calculations have been performed for these 3p-excited resonances of neutral calcium and compared to experimental results. The excitation and subsequent autoionization of these resonances lead to the final ionic 3p6nl states from which new high-lying members of the Rydbergp-series have been resolved experimentally. These new levels agree reasonably well with calculations as well as with the extrapolation of the Rydberg formula. The post collision interaction (PCI) effect has been observed in the transition Ca+ 3p53d4s 2P1/2,3/2 Ca 2+ 3p6 1S0 + eTer and explained by means of the rather long core-hole lifetime, while the decay of Ca+ 3p53d4s 4P1/2,3/2,5/2 states is not affected by PCI.
KW - Ab initio calculations
KW - Atomic Ca
KW - Photoelectron yield
KW - Post collision interaction
KW - Resonant Auger decay
KW - Rydberg states
UR - http://www.scopus.com/inward/record.url?scp=84876372137&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84876372137&partnerID=8YFLogxK
U2 - 10.1016/j.elspec.2013.01.015
DO - 10.1016/j.elspec.2013.01.015
M3 - Article
AN - SCOPUS:84876372137
VL - 186
SP - 8
EP - 13
JO - Journal of Electron Spectroscopy and Related Phenomena
JF - Journal of Electron Spectroscopy and Related Phenomena
SN - 0368-2048
IS - 1
ER -