| Автор | C W Bauschlicher Jr |
| Автор | S R Langhoff |
| Автор | H Partridge |
| Дата выпуска | 1985-04-28 |
| dc.description | Theoretical studies of the lowest <sup>1</sup>S, <sup>1,3</sup>P and <sup>1,3</sup>D states of calcium and strontium are presented. The excitation energies, dipole-allowed transition moments and the <sup>1</sup>D-<sup>1</sup>S quadrupole moment are studied as a function of the one-particle and molecular orbital bases and level of correlation treatment. Including core-valence correlation significantly reduces the magnitude of the dipole and quadrupole transition moments, producing oscillator strengths that lie within the experimental error bars. On the basis of relativistic effective-core potential calculations, the authors find that, unlike barium, the strontium transition moments are not significantly changed when relativistic effects are included. Spin-forbidden transitions were assumed to occur entirely as a result of the breakdown of LS coupling. The magnitude of the singlet-triplet mixing was determined both by ab initio calculation and from the observed deviations from the Lande interval rule. The calculated <sup>1</sup>D<sub>2</sub> state lifetime for Ca is 3.1+or-0.3 ms, which is in reasonable agreement with the experimental value of 2.3+or-0.5 ms (with an absolute upper bound of 4 ms). The dominant decay mechanism is spin-forbidden dipole-allowed transitions, with only 12% arising from quadrupole transitions. Similarly for the <sup>1</sup>D<sub>2</sub> state of Sr, the authors compute a radiative lifetime of 0.49+or-0.04 ms with only 2% of the decay from quadrupole transitions. |
| Формат | application.pdf |
| Издатель | Institute of Physics Publishing |
| Название | The radiative lifetime of the <sup>1</sup>D<sub>2</sub> state of Ca and Sr: a core-valence treatment |
| Тип | paper |
| DOI | 10.1088/0022-3700/18/8/011 |
| Print ISSN | 0022-3700 |
| Журнал | Journal of Physics B: Atomic and Molecular Physics |
| Том | 18 |
| Первая страница | 1523 |
| Последняя страница | 1532 |
| Аффилиация | C W Bauschlicher Jr; NASA Ames Res. Center, Moffett Field, CA, USA |
| Аффилиация | S R Langhoff; NASA Ames Res. Center, Moffett Field, CA, USA |
| Аффилиация | H Partridge; NASA Ames Res. Center, Moffett Field, CA, USA |
| Выпуск | 8 |
