| Zugriffsnummer | 18629 |
| Dokumenttyp | Zeitschriftenartikel |
| Sprache | Englisch |
| Titel | Multi-photon ionization of molecular nitrogen by femtosecond soft X-ray FEL pulses |
| Autor(in); Institution |
Sorokin, Andrei A.; 7.1, Photonenradiometrie, PTB-Berlin; Ioffe Physico-Technical Institute, St. Petersburg, RUSSIA
Bobashev, S.V.; Ioffe Physico-Technical Institute, St. Petersburg, RUSSIA
Tiedtke, K.; Deutsches Elektronen-Synchrotron DESY, Hamburg, GERMANY
Richter, Mathias; 7.1, Photonenradiometrie, PTB-Berlin
|
| Quelle/Jahr | Journal of Physics B: 39 (2006), 14, L299 - L304 |
| ISSN | 0953-4075 |
| DOI | |
| Verlag | Bristol: IOP Publ. |
| Zusammenfassung | At the new free-electron laser (FEL) for vacuum ultraviolet (VUV) and soft x-ray radiation FLASH of the Deutsches Elektron-Synchrotron (DESY) in Hamburg, multi-photon double ionization of molecular nitrogen has been observed and studied by ion time-of-flight spectroscopy. The experiments have been performed at the microfocus beamline BL2 with photon pulses of 25 fs duration and irradiance levels up to 2 x 1013 W cm-2 at a photon energy of 38 eV, i.e. well above the first ionization/dissociation thresholds of the target. A new and important aspect of our experiments has been the reliable determination of absolute photon numbers per pulse with the help of a calibrated setup allowing the investigation of nonlinear effects by quantitative measurements. Results obtained are discussed in terms of a sequential two-photon ionization scheme. |
