Experimental and theoretical study of bound and quasibound states of Ce

The negative ion of cerium is investigated experimentally with tunable infrared laser photodetachment spectroscopy and theoretically with relativistic configuration interaction in the continuum formalism. The relative cross section for neutral atom production is measured with a crossed ion-beam-lase...

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Bibliographic Details
Published in:Physical review. A, Atomic, molecular, and optical physics Atomic, molecular, and optical physics, 2011-09, Vol.84 (3), Article 032514
Main Authors: Walter, C. W., Gibson, N. D., Li, Y.-G., Matyas, D. J., Alton, R. M., Lou, S. E., Field, R. L., Hanstorp, D., Pan, Lin, Beck, Donald R.
Format: Article
Language:English
Subjects:
AFFINITY
ANIONS
Atom and Molecular Physics and Optics
Atom- och molekylfysik och optik
ATOMIC AND MOLECULAR PHYSICS
ATOMS
BOUND STATE
CERIUM
CROSS SECTIONS
ELECTRIC DIPOLES
EV RANGE
EXCITED STATES
FINE STRUCTURE
GROUND STATES
ION BEAMS
LASERS
PARITY
PEAKS
PHOTONS
QUASIBOUND STATE
RELATIVISTIC RANGE
RESONANCE
SPECTROSCOPY
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Summary:The negative ion of cerium is investigated experimentally with tunable infrared laser photodetachment spectroscopy and theoretically with relativistic configuration interaction in the continuum formalism. The relative cross section for neutral atom production is measured with a crossed ion-beam-laser-beam apparatus over the photon energy range of 0.54-0.75 eV. A rich resonance spectrum is revealed near the threshold with, at least, 12 peaks observed due to transitions from bound states of Ce{sup -} to either bound or quasibound excited states of the negative ion. Theoretical calculations of the photodetachment cross sections enable identification of the transitions responsible for the measured peaks. Two of the peaks are due to electric dipole-allowed bound-bound transitions in Ce{sup -}, making cerium only the second atomic negative ion that has been demonstrated to support multiple bound states of opposite parity. In addition, combining the experimental data with the theoretical analysis determines the electron affinity of cerium to be 0.628(10) eV and the fine structure splitting of the ground state of Ce{sup -} ({sup 4} H{sub 7/2}-{sup 4} H{sub 9/2}) to be 0.097 75(4) eV.
ISSN:1050-2947
1094-1622
DOI:10.1103/PhysRevA.84.032514