Single and double ionization of strontium in the vicinity of four-photon excitation of the 5p(2) (1)S(0) doubly excited state
| dc.contributor.author | Liontos, I. | en |
| dc.contributor.author | Cohen, S. | en |
| dc.contributor.author | Bolovinos, A. | en |
| dc.date.accessioned | 2015-11-24T18:35:28Z | |
| dc.date.available | 2015-11-24T18:35:28Z | |
| dc.identifier.issn | 0953-4075 | - |
| dc.identifier.uri | https://olympias.lib.uoi.gr/jspui/handle/123456789/17100 | |
| dc.rights | Default Licence | - |
| dc.subject | multiphoton double ionization | en |
| dc.subject | laser optogalvanic spectroscopy | en |
| dc.subject | above-threshold ionization | en |
| dc.subject | multi-photon ionization | en |
| dc.subject | autoionizing states | en |
| dc.subject | even-parity | en |
| dc.subject | theoretical-analysis | en |
| dc.subject | picosecond pulses | en |
| dc.subject | charged ions | en |
| dc.subject | ba atoms | en |
| dc.title | Single and double ionization of strontium in the vicinity of four-photon excitation of the 5p(2) (1)S(0) doubly excited state | en |
| heal.abstract | We report on the single and double multiphoton ionization of ground state Sr atoms observed in an atomic beam experiment with laser pulses of similar to 5 ns duration, maximum intensity similar to 4 x 10(11) W cm(-2) and within the 710-740 nm wavelength range. The Sr(+) spectrum consists of two strong lines originating from three-photon resonant four-photon ionization of bound states, a number of weak autoionizing resonances and a broad line due to four-photon excitation of the doubly excited 5p(2) (1)S(0) state. The latter, along with a strong, broad and structured spectral feature, is also evident in the wavelength dependence of the doubly charged Sr(2+) ion. A weakly evident but reproducible inflection point ('knee' structure) appears in the intensity dependence of the Sr(2+) yield at the location of the 5p2 1S0 resonance. A complementary fluorescence experiment revealed the accumulation of population in the 5p(1/2,3/2), 6s(1/2) and 5d(3/2,5/2) excited Sr(+) states during the laser pulse. All fluorescence signals depend on laser wavelength in a manner similar to the recorded Sr(+) spectrum. The population accumulation in the 5p(1/2,3/2) ionic states unambiguously proves the absorption of two photons above the first 5s(1/2) atomic threshold while that of the 5d(3/2),(5/2) and 6s(1/2) ones suggest the absorption of at least two more. Since under our laser pulse duration and intensity the absorption of such a number of photons in an unstructured continuum is highly improbable, it may be concluded that the process is mediated by dense manifolds of near-resonant doubly excited states, their role in the dynamics of laser - atom interaction under our conditions being far more crucial than in studies conducted using intense ultrashort pulses. | en |
| heal.access | campus | - |
| heal.fullTextAvailability | TRUE | - |
| heal.identifier.primary | Doi 10.1088/0953-4075/41/4/045601 | - |
| heal.identifier.secondary | <Go to ISI>://000253547600025 | - |
| heal.identifier.secondary | http://iopscience.iop.org/0953-4075/41/4/045601/pdf/0953-4075_41_4_045601.pdf | - |
| heal.journalName | Journal of Physics B-Atomic Molecular and Optical Physics | en |
| heal.journalType | peer reviewed | - |
| heal.language | en | - |
| heal.publicationDate | 2008 | - |
| heal.recordProvider | Πανεπιστήμιο Ιωαννίνων. Σχολή Επιστημών και Τεχνολογιών. Τμήμα Βιολογικών Εφαρμογών και Τεχνολογιών | el |
| heal.type | journalArticle | - |
| heal.type.el | Άρθρο Περιοδικού | el |
| heal.type.en | Journal article | en |
Αρχεία
Φάκελος/Πακέτο αδειών
1 - 1 of 1
Φόρτωση...
- Ονομα:
- license.txt
- Μέγεθος:
- 1.74 KB
- Μορφότυπο:
- Item-specific license agreed upon to submission
- Περιγραφή: