| Zugriffsnummer | 29145 |
| Dokumenttyp | Zeitschriftenartikel |
| Sprache | Englisch |
| Titel | Energy levels of Th+ between 7.3 and 8.3 eV |
| Autor(in); Institution |
Herrera-Sancho, Oscar Andrey; 4.4, Zeit und Frequenz, PTB-Braunschweig
Nemitz, Nils; 4.4, Zeit und Frequenz, PTB-Braunschweig
Okhapkin, Maksim V.; 4.4, Zeit und Frequenz, PTB-Braunschweig
Peik, Ekkehard; 4.4, Zeit und Frequenz, PTB-Braunschweig
|
| Quelle/Jahr | Physical Review A: 88 (2013), 1, 012512-1 - 012512-7 |
| ISSN | 1050-2947 (PRINT) ; 1094-1622 (ONLINE) |
| DOI | |
| URL | |
| Verlag | Melville, NY: AIP |
| Klassifikationscode | PACS: 32.30.Jc ; PACS: 32.80.Rm ; PACS: 42.62.Fi ; PACS: 37.10.Ty |
| Freie Schlagworte | laser excitation of trapped Th ions ; pulsed laser radiation ; electronic bridge excitation ; energy levels |
| Zusammenfassung | Using resonant two-step laser excitation of trapped 232Th+ ions, we observe 43 previously unknown energy levels within the energy range from 7.3 to 8.3 eV. The high density of states promises a strongly enhanced electronic bridge excitation of the 229mTh nuclear state that is expected in this energy range. From the observation of resonantly enhanced three-photon ionization of Th+, the second ionization potential of thorium can be inferred to lie within the range between 11.9 and 12.3 eV. Pulsed laser radiation in a wide wavelength range from 237 to 289 nm is found to provide effi cient photodissociation of molecular ions that are formed in reactions of Th+ with impurities in the buffer gas, leading to a signi cantly increased storage time for Th+ in the ion trap. |
