Allowed and spin-forbidden electric dipole transitions in Ca I
- Department of Computer Science, P.O. Box 1679B, Vanderbilt University, Nashville, Tennessee 37235, USA (United States)
Energy levels, transition probabilities, and lifetimes have been determined for all levels of the Ca I spectrum up to 3d4p {sup 1}F{sub 3}{sup o} using the multiconfiguration Hartree-Fock method with lowest-order relativistic effects included through the Breit-Pauli Hamiltonian. The mixing of singlet and triplet configuration states was found to be considerably stronger in 4s5p {sup 1,3}P{sub 1}{sup o} levels than in 4s4p {sup 1,3}P{sub 1}{sup o} levels. The near degeneracy of the nonrelativistic 3d4p {sup 3}F{sup o} and {sup 1}D{sup o} term energies, differing by only 39.59 cm{sup -1} resulted in highly mixed Breit-Pauli levels for 3d4p {sup 3}F{sub 2}{sup o} and {sup 1}D{sub 2}{sup o}. Some intercombination transitions from these levels have transition probabilities of magnitude similar to weaker spin-allowed transitions. The ''fine-tuned'' transition probability for the 4s4p {sup 3}P{sub 1}{sup o}-4s4d {sup 1}D{sub 2} transition was found to be 1.53x10{sup 3} s{sup -1}, in agreement with a quenching rate observed in a doppler cooling experiment [Binnewies et al., Phys. Rev. Lett. 87, 123002 (2001)].
- OSTI ID:
- 20639897
- Journal Information:
- Physical Review. A, Vol. 68, Issue 1; Other Information: DOI: 10.1103/PhysRevA.68.012507; (c) 2003 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 1050-2947
- Country of Publication:
- United States
- Language:
- English
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