| Автор | D L Ederer |
| Автор | T B Lucatorto |
| Автор | E B Saloman |
| Автор | R P Madden |
| Автор | J Sugar |
| Дата выпуска | 1975-02-21 |
| dc.description | The absorption spectrum of gaseous barium was obtained between 120 AA and 140 AA, the region of the N<sub>IV,V</sub> thresholds. The similarity to lanthanum of some of the features observed in barium suggests that the 4f orbital contracts and overlaps the 4d orbit. This contraction produces two terms, <sup>3</sup>P and <sup>3</sup>D, of the 4d<sup>9</sup>4f configuration below the 4d ionization limits, while the large electrostatic exchange interaction drives the <sup>1</sup>P term of this configuration some 10 eV above the limit. Furthermore, extensive mixing of the 4d<sup>9</sup>(6s<sup>2</sup>)6p configuration with 4d<sup>9</sup>(5d<sup>2</sup>)6p and 4d<sup>9</sup>(5d6s)6p produces many weak resonances in addition to the resonances associated with the 4d<sup>9</sup>4f configuration. A suggested classification of these features is given with the aid of known features of the La I spectrum. Finally, from the known X-ray splitting of the N<sub>IV,V</sub> threshold and the energy interval between the 6s<sup>2</sup>6p <sup>2</sup>P and 6s<sup>2</sup> <sup>1</sup>S levels in La I and La II, the ionization thresholds of the 4d electron were determined to be 814800 (1000) cm<sup>-1</sup> and 792500 (1000) cm<sup>-1</sup>. |
| Формат | application.pdf |
| Издатель | Institute of Physics Publishing |
| Название | Photoabsorption of the 4d electrons in barium |
| Тип | lett |
| DOI | 10.1088/0022-3700/8/3/001 |
| Print ISSN | 0022-3700 |
| Журнал | Journal of Physics B: Atomic and Molecular Physics |
| Том | 8 |
| Первая страница | L21 |
| Последняя страница | L25 |
| Аффилиация | D L Ederer; Nat. Bur. Stand., Washington, DC, USA |
| Аффилиация | T B Lucatorto; Nat. Bur. Stand., Washington, DC, USA |
| Аффилиация | E B Saloman; Nat. Bur. Stand., Washington, DC, USA |
| Аффилиация | R P Madden; Nat. Bur. Stand., Washington, DC, USA |
| Аффилиация | J Sugar; Nat. Bur. Stand., Washington, DC, USA |
| Выпуск | 3 |
