Core effect on the diamagnetic spectrum of barium Rydberg states
| Autor: | Wei Gao, X. Liu, H. P. Liu, Huahao Yang, Wei Quan |
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| Rok vydání: | 2012 |
| Předmět: | |
| Zdroj: | Physical Review A. 85 |
| ISSN: | 1094-1622 1050-2947 |
| DOI: | 10.1103/physreva.85.032508 |
| Popis: | We study the core effect of nonhydrogenic alkaline-earth-metal barium in its diamagnetic spectrum by one photon transition from the ground state 6s(2) S-1(0) experimentally and theoretically. The non-Coulombic potential of the ion core introduces an extra energy shift compared with hydrogen and a level anticrossing between different n manifolds, characterized by the quantum defect of the concerned angular momentum states. With a complex rotation coordinate technique and a B-spline expansion method, we develop a matrix-form Hamiltonian based on an effective potential incorporating the angular-dependent quantum defect into the angular rotation term. The nonhydrogen core effects are investigated by sweeping the quantum defects of different channels in the calculation. Results show that quantum defects of p and f states have a undeniable effect on the intensities and positions of the spectral lines, although barium is closely hydrogenlike in the energy range examined. The anticrossing spectral lines are also identified with the aid of theoretical calculations. The calculations are in good agreement with the experimental observations. |
| Databáze: | OpenAIRE |
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