Relativistic many-body calculation of energies, lifetimes, hyperfine constants, and polarizabilities in {sup 7}Li
- Department of Physics, University of Notre Dame, Notre Dame, Indiana 46556 (United States)
The excitation energies of ns, np, nd, and nf (n{<=}6) states in neutral lithium are evaluated within the framework of relativistic many-body theory. First-, second-, third-, and all-order Coulomb energies and first- and second-order Breit corrections to energies are calculated. All-order calculations of reduced matrix elements, oscillator strengths, transition rates, and lifetimes are given for levels up to n=4. Electric-dipole (2s-np), electric-quadrupole (2s-nd), and electric-octupole (2s-nf), matrix elements are evaluated to obtain the corresponding ground-state multipole polarizabilities using the sum-over-states approach. Scalar and tensor polarizabilities for the 2p{sub 1/2} and 2p{sub 3/2} states are also calculated. Magnetic-dipole hyperfine constants A are determined for low-lying levels up to n=4. The quadratic Stark shift for the (F=2 M=0){r_reversible}(F=1 M=0) ground-state hyperfine transition is found to be -0.0582 Hz/(kV/cm){sup 2}, in slight disagreement with the experimental value -0.061{+-}0.002 Hz/(kV/cm){sup 2}. Matrix elements used in evaluating polarizabilities, hyperfine constants, and the quadratic Stark shift are obtained using the all-order method.
- OSTI ID:
- 21140483
- Journal Information:
- Physical Review. A, Vol. 77, Issue 2; Other Information: DOI: 10.1103/PhysRevA.77.022510; (c) 2008 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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Related Subjects
COMPUTER CALCULATIONS
CORRECTIONS
COULOMB ENERGY
ELECTRIC DIPOLES
EXCITATION
GROUND STATES
HYPERFINE STRUCTURE
LIFETIME
LITHIUM 7
MAGNETIC DIPOLES
MAGNETIC MOMENTS
MANY-BODY PROBLEM
MATRIX ELEMENTS
OCTUPOLES
OSCILLATOR STRENGTHS
POLARIZABILITY
QUADRUPOLES
RELATIVISTIC RANGE
STARK EFFECT